1495results about How to "Improve electricity safety" patented technology

To secure safety in an electric vehicle during charging, the electric vehicle is provided with a high voltage battery and a charging port portion for charging the high voltage battery. A power reception connector and a connector locking mechanism are provided in the charging port portion, and a fitting hole is formed in a power supply connector disposed on an external power supply side. The connector locking mechanism is switched between a restrained condition, in which a locking pin is inserted into the fitting hole, and a released condition, in which the locking pin is retracted from the fitting hole. A vehicle control unit for controlling the connector locking mechanism switches the connector locking mechanism to the restrained condition when a door is locked, and switches the connector locking mechanism to the released condition when the door is unlocked. Thus, the connection condition between the power reception connector and the power supply connector can be maintained even when a passenger locks the door and moves away from the electric vehicle, and as a result, safety can be secured during charging.

The invention discloses a safe power utilization management system and method based on edge calculation and big data analysis. The invention relates to the technical field of safe power utilization management application. The system comprises an electricity cloud platform, an edge computing gateway and an energy gateway circuit breaker, the power utilization cloud platform is in communication connection with the edge computing gateway to receive and process information of the edge computing gateway; the edge computing gateway is in communication connection with the energy gateway circuit breaker; the energy gateway circuit breaker is used as an acquisition terminal and a control device and is installed on a service entrance line of the power utilization unit. On the basis of the power Internet of Things, more comprehensive user power utilization related data can be obtained at a lower communication cost; data processing pressure of a cloud platform is effectively shared by utilizing anedge computing technology, big data analysis is carried out on the basis of massive user power utilization data, auxiliary decision support for reducing power utilization safety risks and improving power utilization efficiency is provided for users, various types of users are supported, and the requirement for real-time performance of power utilization monitoring is met.

The invention discloses a water cup device, which comprises a plug connected to the water cup through wires and an electrical socket connected to the plug. There are first sliding grooves extending from left to right in the seat, which are mutually symmetrical up and down. Between the two first sliding grooves, there is an electric plugging groove with the opening facing the right and mutually symmetrical up and down. In the electric plugging groove A contact piece is fixedly installed, and a second sliding groove connecting the two first sliding grooves is also arranged in the socket. A sliding arm can slide left and right in the first sliding groove, and the sliding arm is right A first toothed bar is provided on the end face facing the electrical insertion slot, and an engaging arm is installed in the second sliding slot so as to slide left and right, and the engaging arm is fixedly connected to the sliding arm.

The invention discloses a power supply assembly for electrical appliance equipment. The power supply assembly comprises a power supply seat and a plug, wherein the power supply seat is fixedly arranged in a wall, the plug is connected with a household electrical appliance, slots are vertically and symmetrically formed in the power supply seat and are provided with rightward openings, an upper installation groove and a lower installation groove are symmetrically formed in a left side of the power supply seat and communicate with the slots, telescopic grooves are symmetrically formed in a rightside of the power supply seat and communicate with the slots, an upper sliding groove and a lower sliding groove are formed in the center of the power supply seat and respectively communicate with theupper installation groove and the lower installation groove, a communication groove is formed between the upper sliding groove and the lower sliding groove and communicate with the upper sliding groove and the lower sliding groove, an upper gear group and a lower gear group are respectively arranged in the upper installation groove and the lower installation groove, a first sliding strip is arranged in the upper sliding groove and can slide leftwards and rightwards, a first rack is arranged on an end surface of the top of the first sliding strip, a power supply mother block is fixedly arranged at the bottom of a right side of the first sliding strip and extends to the communication groove.

An electric source noise pattern analysis method for vehicle battery protection and power management and device thereof provides ignition status recognized against battery discharge due to electric equipment requirement. Such battery discharge includes normal use of electric appliances and inadvertent use of electric devices. This invention is connected in parallel with the main battery and backup battery of a vehicle. Featuring the addition of a source characteristic sensing unit which analyzes voltages, currents, power noises of main battery and backup battery, and a pattern analysis method which utilizes the sensing characteristics to recognize the running and power used situation of vehicle, and a power management and control unit which employs at least one adjustment timer to manage main battery and backup battery relied on the vehicle situation. The device which operates to connect and disconnect the main and the backup battery from the load based on a sophisticated management algorithm to control to prevent from power exhausted by electric appliances, and the inhibit is concerned in safety of restarting failure in duration the engine shut down or switch off.

A transformer includes a primary winding coil, a plurality of electrically-conductive sheets, a bobbin and a magnetic core assembly. The bobbin includes a first tube member, a second tube member and plural partition plates. The first tube member and the second tube member have a first channel and a second channel therein, respectively. Each partition plate is sheathed around the first tube member and the second tube member and includes a receptacle for accommodating respective electrically-conductive sheet, and the primary winding coil is wound around the second tube member.

The invention provides an apparatus and method for cooking liquid food, which comprises a heating mechanism, a pressure vessel heated by the heating mechanism, a extracting vessel having a connected pipe extending from the bottom of a receiving-filtration mechanism into the pressure vessel and arranged on an opening of the pressure vessel for sealing the opening, a disintegrator inserted into the inner of the extracting vessel. The extracting vessel is filled with food material and cooking water, then the disintegrator is turned on for smashing the food material in the cooking water left in the extracting vessel. After smashed, the food material is heated by boiled cooking water for extracting available component. Stop heating by the heating mechanism in proper time after extracting, then filtrate the extracting liquid form the extracting vessel using the filtrating mechanism, pump the extracting liquid to the pressure vessel for reclaiming employing the pressure decline, caused by heating stop, though the connected pipe.

The invention provided a lamp fixing base. The lamp fixing base is provided with a first body part, wherein a first combining part is arranged on the outer side of the bottom end face of the first body part, an inwards-concave first containing cavity is formed in the middle of the bottom end face of the first body part, and a first electrical connecting part is arranged in the first containing cavity; the fixing base is further provided with an elastic component. The invention further provides a lamp connecting base. The lamp connecting base is provided with a second body part, a second containing cavity used for containing the first body part of the fixing base is formed in the second body part, a second combining part is arranged on the inner wall of the second containing cavity, and a second electrical connecting part is arranged in the middle of the second containing cavity. The invention further provides a lamp fixing device formed by the lamp fixing base and the lamp connecting base. Due to the lamp fixing base, the lamp connecting base and the lamp fixing device, a lamp can be fast installed and detached by an operator, use is easy, and maintenance is convenient.

The embodiment of the invention discloses a power operated tailgate control method and device, and belongs to the technical field of automobile control. The method includes the steps that an operating instruction is formed by collecting switch variables, and a tailgate motor is controlled to move according to the position of a power operated tailgate so that the power operated tailgate can ascend or descend; the voltage drop of a sampling resistor connected into a driving circuit of the tailgate motor in series is collected in real time, and whether the working current of the tailgate motor is larger than a preset current or not when the power operated tailgate is controlled to descend is judged according to the collected voltage drop; and if the working current is larger than the preset current, it is determined that the power operated tailgate breaks down, and the power operated tailgate is controlled to rebound upwards to a preset safety height. According to the power operated tailgate control method and device, whether an obstacle exists or not can be detected automatically when the power operated tailgate is controlled to descend, and therefore the phenomenon that passengers are hurt by jamming is avoided, and tailgate control safety is improved.

The invention relates to an improved industrial dust catcher device. The improved industrial dust catcher device comprises a case and a plug head, wherein the case is fixedly arranged on a rack, the plug head is connected with a dust catcher, at least more than two groups of plug seats are vertically and separately arranged in the case by a partition plate, insertion grooves are vertically and symmetrically formed in the plug seats and are provided with rightward ports, a first rotation cavity is formed in each insertion groove, a second rotation cavity is formed between the two insertion grooves and communicates with the first rotation cavity, a second toothed wheel is arranged in the first rotation cavity, rotation sleeves are symmetrically arranged at a left side and a right side of thesecond toothed wheel, inner diameters of the rotation sleeves are equal to the diameters of the insertion grooves, the two rotation sleeves are rotatably arranged in a left end wall and a right end wall of the first rotation cavity, a spiral hole is formed in a middle part of the second toothed wheel, a first toothed wheel is rotatably arranged at a middle part of the second rotation cavity by arotation shaft and is connected with the second toothed wheel in a matching way, a right end of the rotation shaft is rotatably arranged in a right end wall of the second rotation cavity, and a left end of the rotation shaft is connected with a driver fixedly arranged in a left end wall of the second rotation cavity.

The invention discloses data equipment. The data equipment comprises a power distribution box, a power socket arranged in the right side end surface of the power distribution box and a power plug connected with the data equipment, wherein the top end surface of the power distribution box is fixedly connected with a dust-proof plate through a fixed rod; a front hooking part and a rear hooking partare symmetrically arranged on the left side end surface of the power distribution box; an upper slot and a lower slot of which mouth parts are rightward and are symmetrical to each other are formed inthe power socket; a sliding cavity which extends leftwards and rightwards is formed in the power socket and positioned between the two slots; a left sliding block and a right sliding block slid leftwards and rightwards are mounted in the sliding cavity; an upper power transmission head and a lower power transmission head which are connected with commercial power are symmetrically arranged on theright end surface of the left sliding block; an upper power connector and a lower power connector which are matched with the power transmission heads are symmetrically arranged on the left end surfaceof the right sliding block.

The invention discloses an intelligent power distribution safety control system, which can give an early warning to inform a switch where a hidden danger of overheating occurs, and completely eliminate fire accidents caused by human negligence, untimely inspection and the like. The system consists of temperature sensor, temperature acquisition unit, input memory, data processor, central processing unit, graphic display processing, touch screen, communication processor, Ethernet, SMS unit, control output unit, tripping controller and air breaker The signal output by the temperature sensor installed at each metal contact of the air circuit breaker in the power distribution cabinet is collected by the temperature acquisition unit and input to the storage, data processor and comparator. The display processing, touch screen, and communication processor are used to display and control various parameters, and send over-temperature alarm information through the Ethernet and SMS unit, and trip and power off the air circuit breaker with over-temperature contacts through the control output unit .

The invention relates to an epoxy-pouring full-insulation solid isolating switch, which comprises an isolation body, a grounded contact, an isolation contact, a middle contact, an isolation moving contact, a driving screw rod, a fixed nut and a driving gear part, wherein the grounded contact and the isolation contact are arranged at two ends of the isolation body respectively, the middle part of the isolation body is provided with the middle contact, the upper end of the isolation contact is connected with a bus contact through a bus-bar, the bus contact is arranged on the top of the isolation body, and the isolation moving contact is always contacted with the middle contact through a watch chain sensing finger. The isolation switch slides between two positions of the middle contact and the isolation contact or the middle contact and the grounded contact to form the conduction or the isolation grounding of the isolating switch. The entire isolating switch is poured into a fully-sealed integral structure with epoxy resin.

A motor driving system is disclosed having a control device 4A for controlling a synchronous motor 1, the control device 4A comprising a sensorless control algorithm device 20 that includes an abnormality determining device 25 for determining abnormality of the algorithm based on a magnetic pole position error estimated value of the motor 1. When the abnormality determining device 25 has determined abnormality of the algorithm, the control device 4A controls a power converter 2 using a magnetic pole position detected value detected by a magnetic pole position detector 30 attached to the motor, in place of using a magnetic pole position estimated value. This motor driving system can guarantee reliability of the sensorless control algorithm device 20 while assuring safety. Safety of electric vehicles is enhanced by installing the motor driving system that has been guaranteed reliable.

The invention discloses information data equipment. The information data equipment comprises a distribution box, an electric connecting seat arranged in the right side end face of the distribution boxand an electric connector connected with the data equipment, wherein a dustproof board is fixedly connected to the top end face of the distribution box through an arm lever; hook parts are correspondingly arranged on the left side end face of the distribution box in a front-back corresponding manner; jacks of which ports face rightwards are formed in the electric connecting seat in an up-down corresponding manner; a sliding cavity is formed between the two jacks; an intercommunicated first through groove is formed in the left side of a part between the two sliding cavities; a second through groove is formed between each sliding cavity and the corresponding jack; a sliding block which can horizontally slide leftward and rightward is arranged in each sliding cavity; a pushing groove of which a port faces the first through groove is formed in each sliding block; a third through groove which is intercommunicated from left to right and penetrates through the pushing groove is formed in each sliding block; a pushing block which can vertically and horizontally slide is arranged in each pushing groove; a fourth pushing groove which is intercommunicated from left to right is formed in eachpushing block; a first inclined sliding plane is arranged on the end wall, close to the corresponding first through groove, of each fourth through groove.

An accessory capable of communicating with a camera, includes a terminal section having a plurality of terminals. The plurality of terminals include a startup state providing terminal that provides, to the camera, a detection level by which the camera detects that the accessory is capable of being started up, a data signal terminal that outputs a data signal including information regarding the accessory to the camera, and a first reference potential terminal having a reference potential of the detection level and the data signal. The startup state providing terminal is disposed adjacent to the data signal terminal, and the first reference potential terminal is adjacent to the data signal terminal, and is disposed with the data signal terminal interposed between the startup state providing terminal and the first reference potential terminal.

The invention discloses a high-safety electrical appliance electrifying assembly. The electrical appliance electrifying assembly comprises an inserting-connecting socket fixedly mounted in a wall body, and an inserting-connecting plug connected with an electrical appliance, wherein inserting-connecting grooves are formed in the inserting-connecting socket in front-back symmetry; a telescopic groove is formed in the left end wall of the inserting-connecting socket; a power supply column is glidingly mounted in the telescopic groove; a first sliding groove penetrating the inserting-connecting groove is also formed in the inserting-connecting socket; a second sliding groove which extends up and down and positioned on the left side of the first sliding groove is formed in the inserting-connecting socket; a first through groove is formed between the first sliding groove and the second sliding groove; a second through groove is formed between the second sliding groove and the inserting-connecting groove; a first sliding block which can slide up and down is mounted in the first sliding groove; a second sliding block which can slide up and down is mounted in the second sliding groove; racks are arranged on the inner side end surfaces of the first sliding block and the second sliding block separately; a rotational gear is rotatably mounted in the first through groove, and the rotationalgear extends into the first sliding groove and the second sliding groove to be connected with the racks in a matching manner; and a partition plate is slidably mounted in the second through groove.

The invention relates to an object storage device, and particularly provides an object storage device, which comprises a bottom casing, an object storage plate and a control circuit board, wherein the object storage plate is arranged on the bottom casing and is provided with a plurality of object storage positions, the control circuit board is positioned in the bottom casing and under the object storage plate, a plurality of object sensing devices are respectively arranged on the control circuit board and respectively correspond to the object storage positions, and each object sensing device is used for sensing whether an object is put on the corresponding object storage position or not. The object storage device has the advantages that the objects are stored by the object storage plate, and the control circuit board is positioned under the object storage plate, so the size of the object storage device is obviously reduced, and the object storage device is more compact.

The invention discloses an LED lamp device which comprises a lamp holder part fixedly arranged in a wall and a lamp cap part matched with the lamp holder part in use; the lamp holder part is internally provided with inserting cavities corresponding vertically; the open ends of the inserting cavities face rightwards; a sliding groove extending horizontally is formed in the part, located between thetwo inserting cavities, of the lamp cap part; a left sliding table and a right sliding table which can move horizontally are arranged in the sliding groove; electricity access heads connected with commercial power are formed in the right end face of the left sliding table in a vertically corresponding manner; and electricity connection heads fitting with the electricity access heads are formed inthe left end face of the right sliding table in a vertically corresponding manner.

The invention discloses a fixing device for an advertisement electronic screen. The fixing device comprises a fixing base and the advertisement electronic screen, wherein the fixing base is fixedly installed in a wall, and the advertisement electronic screen is connected with the fixing base in an inserting fixing fit mode; an inserting fixing groove is formed in the left side inner wall of the fixing base, and spring grooves are oppositely formed in the upper side end wall and the lower side end wall of the inserting fixing groove; jacking springs are fixedly arranged on the positions, deviating from the inserting fixing groove, of the inner end walls of one sides of the spring grooves, the positions, close to the inserting fixing groove, of the end parts of one sides of the jacking springs are fixedly connected to isolation plates, and the positions, deviating from the jacking springs, of one sides of the isolation plates are provided with jacking inclined guide surfaces facing the advertisement electronic screen; an electric connecting groove is formed in the right side inner wall of the inserting fixing groove in a communicating mode; and groove holes are formed in the positions, on the upper side end wall and the lower side end wall of the insertion fixing groove, in the fixing base in a communicating mode. According to the fixing device for the advertisement electronic screen, the advertising electronic screen is prevented from being loosened, normal use of the electronic screen is prevented from being influenced by power failure, accidents caused by falling are prevented, and safety and reliability are achieved.

The invention discloses a fireproof cable sleeve. The fireproof cable sleeve is composed of a cable bushing, a connection sleeve, a sealing plug and a broken cable alarming system. The cable bushing is composed of at least two sections of cable passing pipes which are connected through the connection sleeve. The connection sleeve is composed of a pipe wall and a baffle, the cable passing pipes are of a hollow tubular structure, the pipe wall is composed of an outer insulation wall and an inner hot melting wall, and the outer insulation wall and the inner hot melting wall are connected through rib plates to form a fireproof cavity. The broken cable alarming system is composed of a power source, a switch, a buzzer, an early warning wire and an adjusting resistor, and the early warning wire is embedded into the inner hot melting wall and surrounds the inner hot melting wall. On one hand, the cable ignition accident can be effectively eliminated in time and an alarm is given out in time, so that the risk that a cable triggers a fire is reduced greatly; on the other hand, the situation that after one cable breaks down and causes a fire, adjacent cables are damaged is effectively and completely eradicated, the fire damage is reduced greatly, the restoration cost needed after a disaster happens is saved largely, the restoration time spent after a disaster happens is shortened, and the efficiency for eliminating the fire accident is improved.

The invention discloses a novel plug-in water cup device which comprises a water cup, a plug-in tip and a plug-in socket. The plug-in tip is connected with the water cup by a power wire, the plug-in socket is used with the plug-in tip, a handle is fixedly arranged on the end surface of the right side of the water cup, a plugging cavity is equally arranged at the front and the rear of the inside of the plug-in socket, a retraction groove is formed in the wall of the left end of the plug-in socket, a power transmission block is slidably mounted in the retraction groove, a first slide groove which is perforated through the plugging cavity is formed in the plug-in socket, a second slide groove which is elongated in the up-down direction is further formed in the plug-in socket and is particularly formed in the left side of the first slide groove, a first connecting groove is formed in a position between the first slide groove and the second slide groove, a second connecting groove is formed in a position between the second slide groove and the plugging cavity, a first slider is slidably mounted in the first slide groove in the up-down direction, a second slider is slidably mounted in the second slide groove in the up-down direction, toothed connecting strips are arranged on the end surfaces of the inner sides of the first slider and the second slider, a toothed connecting wheel is operationally mounted in the first connecting groove, penetrates the first slide groove and the second slide groove and is fittingly connected with the toothed connecting strips, and a partition plate is slidably mounted in the second connecting groove.

The invention discloses an improved electric power safety power supply assembly. The improved electric power safety power supply assembly comprises an inserting-connecting base body and an inserting-connecting plug body; transverse sliding grooves which extend left and right are symmetrically formed in the inserting-connecting base body up and down; inserting-connecting grooves which have rightward openings and are symmetrical up and down are formed between the two transverse sliding grooves in the inserting-connecting base body; conductive sheets are fixedly mounted in the inserting-connecting grooves; longitudinal sliding grooves connected with the two transverse sliding grooves are also longitudinally formed in the inserting-connecting base body; transverse sliding arms which can slideleft and right are mounted in the transverse sliding grooves; a first rack is arranged on the end plane on the right side, towards the inserting-connecting groove, of each transverse sliding arm; a connecting arm which can slide left and right is mounted in each longitudinal sliding groove; the connecting arm is fixedly connected with the corresponding transverse sliding arm; a power supply blockis fixedly arranged in the central position of the right end plane of each connecting arm; a power supply groove matched with the power supply block is formed in the central position of the right endplane of each longitudinal sliding groove; and conductive inserting rods which are symmetrical up and down are arranged on the left end plane of the inserting-connecting plug body.

The invention provides bridge construction equipment which comprises an electric connecting frame and an electric plug which is connected with power consumption equipment. The upper part of the left end surface of the electric connecting frame is provided with a hanging board which is fixedly mounted. A hanging port with a downward opening is arranged between the hanging board and the electric connecting frame. The electric connecting frame is internally provided with a mounting trough. Sleeves which are symmetrically arranged in the vertical direction are rotatably mounted in the mounting trough. A first gear is fixedly mounted on the sleeve. The middle position of the mounting trough is provided with a middle gear which is rotatably mounted through a rotating shaft and matches the firstgear. The left side of the mounting trough in the electric connecting frame is provided with a sliding chamber which extends in the left-and-right direction. A sliding block which is movable in the left-and-right direction is mounted in the sliding chamber. A threading rod is mounted in the sliding block in a matching manner.

The invention relates to an LED jacklight, comprising a crust, a circuit substrate arranged inside the crust, a plurality of LED light sources distributed and fixed on the circuit substrate, a diffuser arranged at the crust opening and an AC / DC constant current drive power supply arranged on the crust back. The invention is characterized in that a plurality of reflection cups are arranged on the circuit substrate, corresponding to a plurality of LED light sources; each LED light source is positioned in one reflection cup. The LED jacklight has the advantages that the distribution range of light is wide, the illumination distance is long, the brightness is high and even, the thermal resistance of the LED light sources is lower than the threshold temperature, the attenuation of light intensity is little and the service life is long.

The invention discloses a self diagnosis system based on channels of an FPGA analog input device. The self diagnosis system is connected with an analog input device and comprises an FPGA processing unit, an acquisition AD channel, a self diagnosis DA channel and an isolation cell; the FPGA processing unit is connected with the acquisition AD channel and the self diagnosis DA channel, the acquisition AD channel comprises an analog switch, an A / D converter and an isolation unit which are sequentially connected; and the self diagnosis DA channel comprises a D / A converter and an isolation unit. The invention also discloses one self diagnosis method of the self diagnosis system based on the channel of the FPGA analog input device, self diagnosis of a 16-channel analog quantity acquisition channel is realized in parallel, and time cost is reduced. Reliability is high, full-channel and full-code-value parallel detection is realized, and all the channels of the input device do not acquire an external signal on site when self diagnosis operation is carried out. Electrical security is high, and data processing function and the channels of the input device realize electric isolation.

The invention provides an electric power control socket, comprising socket holes, a shell, an electric power control device and a microswitch. The electric power control device comprises a fingerprint scanning unit, a fingerprint matching unit and a controlling unit. The scanning part of the fingerprint scanning unit is arranged on the shell, and the fingerprint scanning unit, the fingerprint matching unit and the controlling unit are connected in sequence. The microswitch is arranged at the back of the socket holes, and is used for processing circuit when a plug is inserted into the socket holes, thereby realizing the control for the electric power through the controlling unit according to the matching result of the finger print. The electric power control socket of the embodiment of the invention controls the electric power of the socket through the fingerprint authentication and the microswitch, and greatly improves the security of electric power utilization without the worry of electric shock accident caused by the playing of the socket of the kids.

The invention discloses an electric heating cleaning method. An electric heating functional component is made of an electric heating or conductive and magnetizing ferromagnetic material, or a functional component is provided with an electric heating part made of an electric heating or magnetizing ferromagnetic material to form the electric heating functional part; the functional component is a device the pollution of which can be eliminated by heating comprises a filter screen, a static purifying device electrode and a blade impeller. The dirt on the surface of the electric heating functional component is dehydrated, inactivated, melted, tendered, carbonized, burnt, shed and stripped by loading the current on the electric heating functional component. A non-stick coating is arranged on the surface of the electric heating functional component. An electric heating cleaning device produced by the method consists of an electric heating functional component and a heating power source. The electric heating cleaning device is characterized in that the electric heating functional component comprises a connecting interface which forms an electric circuit with the heating power source or comprises an electromagnetic coil for forming electromagnetic coupling with the electric heating functional component. The invention has the advantages of favorable cleaning effect, high speed, non-relation to mechanism movement, compact and reliable structure, wide application range, environment friendlessness and no raise dust or waste liquor discharge. Two embodiments are provided by combining with attached drawings.

The invention relates to a transformer structure and a manufacturing method thereof. The transformer structure at least comprises a magnetic core, a coil winding, a coil reel and an insulation casing cover. The coil winding is provided with a primary side coil and a secondary side coil which wind on the coil reel and are integrated with the magnetic core, wherein a primary side input connection end and a reel clamping part are arranged on the coil reel. The insulation casing cover is provided with a first opening which is used for holding the magnetic core, the coil winding and the coil reel,a first sidewall which has a second opening for facilitating the output of the winding, a second sidewall which has a casing cover clamping part which is clamped with the reel clamping part, and a primary side output connection end and a secondary side output connection end. Therefore, the magnetic core of the transformer is effectively isolated from other elements so as to ensure electrical safety.