TWI410014B - Power distribution system with individually isolatable functional zones - Google Patents

Abstract

A power distribution system having a plurality of individually isolatable functional nodes each connected via an isolating device to a power distribution bus that is connected via an isolating device to a power input node which is connectable to a power source, wherein the power distribution bus and the isolating devices are housed in a power distribution compartment, and wherein the power input node and the functional nodes are housed separately from one another and the power distribution compartment in functional compartments adjacent thereto.

Description

Power distribution system with separate isolation functional zones

The present invention relates to a power distribution system having separate isolation functional zones.

Power distribution systems, such as industrial switchboards, typically include a series of supply conductors that are connected to a switch gear. The supply conductor allows large currents to flow through the switching device and is typically individually insulated, partially exposed or incompletely insulated. Therefore, during maintenance, repair, adjustment, etc., the interaction between humans and the electrically powered conductors presents a serious risk of possible death from electric shock and a major risk of disrupting the power supply.

Therefore, it is necessary to find a way to safely handle the power distribution system without interrupting the power supply.

The present invention provides a power distribution system having a plurality of individually detachable functional nodes each connected to a power distribution bus through an isolation device, the bus bar being connected to a power input node through an isolation device, the power input node being connectable to a power source, wherein the power distribution bus bar and the isolation device are housed in a power distribution compartment, and wherein the power input node and the function node are accommodated in a manner separate from each other, and the power distribution compartment is located adjacent to the function Inside the compartment.

The power distribution busbar can be connected to an alternate power input/output node via an isolation device, the node can be connected to an alternate power source or power output, wherein the alternate power input/output node is respectively accommodated adjacent to the power distribution compartment Inside the functional compartment.

The isolation device can be an isolating switch, a circuit breaker, a fuse, or a combination thereof.

The power distribution compartment may have a cover with a hole through which the isolation device can be individually accessed, so that the function node, the power input node, and the alternative power input/output node can be individually connected to the power distribution The bus bars are separated.

The power distribution compartment and the functional compartment can be housed together in a power distribution unit box or switch box.

The electrical switch panel 100 shown in FIG. 1A has a housing 102 and a plurality of electrically isolated and/or grounded box shaped functional compartments 104 disposed along opposite sides of the housing 102. The functional compartment 104 is constructed of an electrically insulating material or a grounded metallic material. The outer casing 102 and the functional compartment 104 may be integrally formed or may be modular components. Current is supplied through a three-phase five-wire supply conductor 106 that traverses the outer casing 102. The three-phase five-wire distribution conductor 108 is electrically connected to the corresponding supply conductor by a T-shaped feed conductor 110. The isolating switch 112 is interposed between the T-shaped feed conductor 110 and the insulating functional compartment 104. Suitable isolation switches 112 may be, for example, insulators, circuit breakers, fuses, and the like. The isolating switch 112, together with the functional compartment 104, provides an electrically insulating functional zone for creating and disconnecting electrical connections between it and the distribution conductor 108 without interrupting supply to the power supply conductor 106 in the powered region of the outer casing 102. energy.

In FIG. 1A, the isolating switch 112 is a circuit breaker, and the functional compartment 104 of the isolating functional zone is coupled to a functional node including a single phase output circuit breaker. The distribution conductor 108 passes directly through the detachable zone into the circuit breaker entering the functional compartment 104 without exposing any of the electrically conductive conductors. Therefore, an electrician who is required to handle the compartment 104 can work without having to worry about accidental contact with an electrical conductor and electric shock.

The switch disk of Figure 1B is substantially identical to the switch disk of Figure 1A. The difference is that the one that can be isolated by the functional block is a three-phase output circuit breaker. In Figure 1C, the isolating switch 112 is an isolator, and the isolating functional zone is coupled to a single phase output circuit breaker. For the sake of clarity, the figures shown in Figures 1A-C are for example electrical connections and example circuit components that can be used to isolate functional zones. It will be appreciated that the switch panel 100 can be implemented in any suitable number of detachable functional zones, with any and all single or multiple of conventional isolation switches 112 and conventional circuits, components, devices, and the like. Combination.

The example switch panel 200 shown in FIG. 2 has a plurality of different three-phase three-pole isolating functional zones with example circuits, components, devices, etc., the representative letters of which represent the following meanings.

A main input power B instead of input power / full rated output power C three-phase upstream circuit breaker, used to protect the detachable functional zone with three-phase output terminals with D three-phase isolators, with full rated link (cable Line or bar) for power supply to an isolated functional zone with a three-phase output circuit breaker with an E-phase three-phase upstream circuit breaker for protection against power supply to an isolated functional zone with a three-phase output circuit breaker Three-phase upstream circuit breaker for protecting the detachable functional zone with a single-phase output breaker matched with a G three-phase upstream circuit breaker for protecting the detachable functional zone with a single-phase output breaker With H three-phase upstream circuit breaker, it is used to protect the isolated functional zone with single-phase output breaker. I Single-phase upstream circuit breaker for protection of the isolated functional zone with a single-phase output breaker. J single-phase upstream circuit breaker for protection of the isolated functional zone with a single-phase output breaker. K single-phase upstream circuit breaker for protection of the isolated functional zone with a single-phase output breaker. L single-phase isolator with full rated link (cable or bar) for power supply to an isolated functional zone with a single-phase output circuit breaker with M-no-volt auxiliary auxiliary contact, to the circuit breaker The circuit breaker is used to supply power to the meter without the volt-isolated functional zone/no-volt conductor. The N-volt-free auxiliary state contact is connected to the circuit breaker, and the circuit breaker is used to supply power to the volt-free circuit. Isolation function zone with/without volt conductor monitoring and surge protection device O no volt auxiliary state contact, coupled to one of the isolated functional zone zones, single phase output circuit breaker / no volt conductor P volt-free auxiliary state contact , is connected to a three-phase upstream circuit breaker / no volt conductor Q volt-free end can be isolated functional zone, used to establish an automatic system (BAS) interface R metering can be isolated functional zone, using a flow comparator as a short-circuit facility Bridging to eliminate the risk of electrocution when contact with a three-phase power isolation device that supplies a meterable isolating functional zone/no volt output conductor, the end of the isolated functional zone/no volt output conductor is adjacent No volts Functional zone with QS monitoring / surge protection / indicator light can be isolated from the energy supply zone, connected to the isolation device for monitoring the three-phase power supply of the isolated functional zone / no volt output conductor, this can isolate the functional zone The end point of the /volt-free output conductor is in the adjacent volt-free isolating functional zone with the QT converter isolating functional zone for the current divider located in the inner zone with its outer casing, so that it is not necessary to isolate the entire switchboard In the case of 200, a non-maintenance flow comparator U converter is provided for isolating the functional area for the current divider located in the adjacent detachable functional zone L so as not to isolate the entire switchboard 200 Provide a maintainable flow comparator

The above electrical circuits, components, devices, etc., and the quarantinable functional zone are merely examples. It should be understood that the switch panel 200 can also be implemented with any or all of a single or multi-phase combination of conventional electrical circuits, components, devices, and the like.

3A-B are illustrations of an isolated functional zone of the present invention for use in a power distribution system 300, such as a three inter-connected power distribution system for use in an industrial location (e.g., a dual UPS mesh system of a data center). Referring to Figure 3A, power is supplied to system 300 by two risers. The take off boxes A, B of the riser each have their detachable functional zones to change the protector and cut or connect the conductors within the functional zone without isolating the individual risers.

The main switch disks C, D of system 300 each have an isolated functional zone for the primary input power source and the alternate input power source. The automatic transfer switch (ATS) switch disks E, F have an isolating functional zone for the two main power sources and the alternate input power source. In the C, D, E, F switch panels, the primary or alternate input power supply isolation functional zone can be used to provide a fully rated output power supply. Individual isolation protection devices in the powered regions of switch disks C, D, E, F can be modified to suit different field requirements for mating with bolted crimped lug connections The isolated functional area is powered. The quarantinable functional blocks retained on the C, D, E, F switchboards can be mounted using terminal or bolted ear connections for powering downstream switchboards/equipment while servicing, updating and adding system 300 Parallel alternative power supplies are provided during capacity. Switch pads G, H have an detachable functional zone that provides a choice when reconfiguring the cable connection without interrupting the power supply.

Referring to Figure 3B, the static transfer switches I, J each contain an detachable functional zone that can reconfigure the cable configuration without power interruption. The main distribution disk and the sub-distribution disk of system 300 are provided by switch disks K, L and switch disks M, N, respectively. Each of these switchboards has an isolating functional zone that provides the same general functionality as switch discs C, D, E, F as described above. In order to provide sub-line assignments in system 300, sub-switch disks M, N may have detachable functional zones generally associated with switch disk 200 as discussed above, as discussed above in FIG.

In Figure 4, the detachable functional zone 400 of the present invention contains a critical load E (e.g., an electric motor, an electric device, a computer device, a communication device, etc.) that requires a substantially continuous power source. Zone A, which isolates zone 400, provides the primary input power, while zone B provides an alternate parallel input. In the quarantinable functional zone, C contains a main input power isolator, while zone D contains an alternative parallel input power isolator. The zone F provides a connection terminal that is connected to the critical load E. In use, the parallel input power source of the isolated functional zone A, B, C, D can be continuously or alternatively disconnected or connected to or connected to the primary or secondary main switch disk for use therein. The main switch panel/power supply must be shut down for continuous maintenance of critical load E during electrical maintenance.

Figures 5 through 7 show a power distribution unit box 500 in accordance with one embodiment of the present invention. The power distribution unit box 500 is configured for distribution to a row of server boxes (not shown) in the data room. Advantageously, the power distribution unit box 500 is shaped and sized to match the shape and size of the server box. The power distribution unit box includes a power distribution bus circuit (or backplane) 502 that is connectable to the cable via a disconnector 504 to a plurality of individually isolated functional nodes 506. The power distribution bus 502 is connected through an isolation switch 504 to a power input node 508 that can be coupled to a power source. The power distribution bus circuit 502 can also be coupled to the alternate power input/output node 512 via the circuit breaker 510, which can be connected to an alternate power source or power output.

The power distribution busway 502 is housed in an insulated power distribution compartment 514, while the functional node 506, the power input node 508, and the alternate power input/output node 512 are individually housed and separated from each other, while the power distribution compartment 514 is in another In a functional compartment adjacent to it and covered. As can be clearly seen in Figure 6, the power distribution compartment 514 has a cover 518 with a plurality of holes through which the electrical technician can access the disconnector 504 and the circuit breaker 510 to provide the functional node 506, power input. Node 508 and alternate power input/output node 512 can be individually isolated from power distribution busway 502. The functional compartments that house function node 506, power input node 508, and alternate power input/output node 512 can be individually numbered or coded so that their location can be easily found during wiring, maintenance, and repair. The functional compartment and its cover can be painted in a different color than the power distribution compartment 514 and its cover 518 to individually resolve the quarantinable and powered areas of the power distribution unit box 500. For example, the functional compartment and its cover can be painted white, while the power distribution compartment 514 can be painted orange.

As shown in FIG. 7, the functional node 506 housed within the functional compartment (for clarity, the cover is not shown) includes an auxiliary state contact 520 that is coupled to the circuit breaker 522. Referring again to Figures 5 and 6, one or more of the functional nodes 506 can be received within the compartment provided by the cover of the power distribution unit box 500. These functional nodes 506 include a power quality meter, a power available indicator, a volt detection relay, or a surge suppressor. It can be appreciated that functional node 506 can be an interface or connection point for any or all of the conventional electrical components, devices, instruments, loads, and the like. Figures 8 through 10 show different three-pole and four-pole wiring configurations for the power distribution bus 502 and the function node 506 (only six of which are shown for clarity). It can be understood that the power distribution unit box 500 can be implemented alternatively by any of the following conventional configuration types or grounding patterns: the number of poles; the number of wirings; voltage; single-phase or three-phase; two-pole three-wire; four-pole five Line; two poles and two lines; three poles and three lines.

11 shows that the present invention can also be implemented as a switch box 600 that typically includes a power distribution busway (or backplane) 602 that is coupled to a plurality of individually isolated functional nodes 606 via a circuit breaker 604 and a cable. The power distribution bus 602 is coupled through an isolation switch 608 to a power input node 610 that can be connected to a power source. The power distribution busway 602 is also coupled to the alternate power input/output node 612 via the circuit breaker 604, which can be connected to an alternate power source or power output. The power distribution busway 602 is housed within the power distribution compartment 614, while the functional node 606, the power input node 610, and the alternate power input/output node 612 are individually housed and separated from each other, while the power distribution compartment 614 is in another In the adjacent functional compartment. The functional compartment and power distribution compartment 614 each have their own cover. As before, the cover of the power distribution compartment 614 has holes (not shown in Figure 11 for clarity) through which the electrician can individually access the circuit breaker 604 and the disconnector 608 for functional nodes 606, Power input node 610 and alternate power input/output node 612 are individually isolated from power distribution busway 602. Again, the functional compartments that house functional node 606, power input node 610, and alternate power input/output node 612 can be individually numbered or coded so that they can easily find their location during wiring, maintenance, and repair. Additionally, the power distribution compartment 614 can be painted orange to distinguish between the powered and disconnectable areas of the switch box 600.

In the illustrated embodiment, the functional node 606 housed within the functional compartment includes a terminal and an auxiliary state output. An additional functional node 606 is housed within the compartment provided by the cover of the functional compartment. These functional nodes 606 include a power quality meter, an indicator light that is available for power, a volt inductive relay, or a surge suppressor. It can be appreciated that the functional node 606 can be an interface or connection point for any and all conventional electrical components, devices, instruments, circuits, loads, and the like. Figure 12 shows a three-pole wiring configuration of the power distribution bus 602 and the function node 606, but it will be appreciated that the switch box 600 can alternatively be implemented in any and all of the following conventional or grounded versions: pole Number; number of wiring; voltage; single-phase or three-phase; two-pole three-wire; four-pole five-wire; two-pole two-wire; three-pole three-wire and so on.

The design of the power distribution system embodiment of the present invention allows an electrician to work safely on communication devices and other platforms supported by the switch panel and the power system without requiring the worker to work on the powered electrical equipment without interruption Continuity of telecommunications equipment and other platforms. Embodiments of the invention have the following advantages.

Risk - Career Health and Safety - Eliminates the risk of electrotechnicians dying of electric shock.

Risk - Human Intervention - Eliminates the risk that human intervention may result in the need to stop powering critical loads.

Risk - Loss of Power Continuity - Many electrical procedures can be performed without galvanic isolation of critical loads.

Risk - financial impact on the business - many electrical procedures can be performed without galvanic isolation of critical loads. Reduce the planned shutdown of the power distribution system, thereby reducing the loss of power continuity that it may cause.

Service Procedures - In the event that the upstream switch panel must be serviced, a fully rated parallel alternate power supply can be provided for a switch panel with individually separable functional zones without interrupting the power supply to critical loads.

Upgrade Procedure - When the existing electrical mesh system must be reconfigured/upgraded/alternately used, a fully rated parallel alternate input power supply (primary power supply) can be provided to the switch panel by an upstream switch panel with individually separable functional zones. There is no need to interrupt the power supply to critical loads.

The end-to-end solution operating on a critical power distribution system that is powered off eliminates the risk of electrocution when performing critical work on critical power distribution systems being powered. Allows an electrician to perform his work without having to isolate the power distribution infrastructure/switchboard/sub-switch disk/multiple sub-loops while performing work on critical power distribution systems.

Design Criteria - In the electrical mesh design phase, individually separable functional zones provide substantial flexibility for the continuity of critical load power supplies during maintenance procedures, including, for example, hot melt printing measurements - troubleshooting; upgrade procedures Shutdown - rapid re-powering of critical loads - by taking power from a detachable functional zone switchboard for temporary cable connections to supply power to the temporary switchboard to restore critical load power; AC power distribution - all Unlimited voltage; DC power distribution - all voltages are unlimited; current - no limit.

Embodiments of the present invention provide individually separable functional zones that are free of electrical conductors when isolated, thus eliminating or at least minimizing the risk of electrocution. Embodiments enable an electrician to isolate an individually detachable functional zone for each outward circuit/cable and change the protection within the quarantinable functional zone to allow for "changing site requirements" without isolation The entire switch panel, for example, single-phase/three-phase 15 to 32 amps to the outgoing sub-line/15-32 amp field switch socket.

Embodiments of the present invention also provide a separately separable functional zone for a fully rated replacement (feedback) input supply line/cable that can also be used as a fully rated outsourced line. Embodiments also provide individually detachable functional zones for the take-off box of the electrical riser. In addition, the embodiments also enable the electrician to isolate the quarantinable functional zone by operating the protective device within the removal box and allow the circuit/cable to be connected/cut in the quarantinable functional zone to change field requirements. There is no need to isolate the entire riser.

Embodiments of the present invention also provide individually quarantinable functional zones for monitoring/metering/surge suppression devices. This allows the electrician to isolate the individual isolated functional zones for voltage monitoring/power quality metering/surge suppression equipment for upgrade and maintenance needs.

Additionally, embodiments of the present invention also provide a volt free connection with a BAS terminal that can individually isolate the functional zone. This allows the electrician to perform volt-free monitoring of the circuit breaker status/supply voltage detection/surge suppression status in the individual functional zones where the volts are connected to the BAS connection end point.

In the switch disk embodiment, the individually separable functional zone can be passed through the powered area of the switch disk through a dedicated isolator/circuit breaker/fuse - for isolating 1, 2, 3 or 4 of each individually separable functional zone. Pole - supply its required power. The end of the neutral conductor that supplies power to the quarantinable functional zone is in the powered zone of the switch bar to the conventional neutral bar, and in the case of a 4-pole switching configuration, the neutral bar is directly connected to the isolation / breaker - (4 poles). The end of the ground conductor that supplies power to the quarantinable functional zone is in the powered area of the switchboard to the conventional earth bar. The end points of all internal switchboard conductors between the powered area of the switch panel and the quarantinable functional zone are in the area underneath the bolted ear connection and the bolted terminal, and whether in the electrical zone or isolated function No special coverage is required in the area. Outer secondary cable protection or sub-circuit cable protection 1, 2, 3 and 4 pole options can be completed during the design phase in order to repair the detachable functional zone with switch panel and when connected to critical loads, There can be an alternative protection device in the detachable functional zone. For example, if a three-phase 63 amp dedicated isolator/circuit breaker/fuse is used in the powered area to supply power to the quarantinable functional zone, and if there is a conductor between the electrical zone and the quarantinable functional zone, When dimensioned and properly protected, the protection in the functional zone can be isolated to select between single-phase, two-phase and three-phase and current ratings of 10, 20, 32, 40, 50, 63 amps. Change sexually. This allows the sub-primary and final sub-loops to be flexibly replaced without isolating other critical loads connected to the same switchboard. As a result, the ends of the conductors in the cable connected or disconnected by the switch disk are connected to the circuit breaker, the fuse combination, the terminals, etc. in a separate isolation zone or bolted to the copper connection.

Embodiments of the present invention obviate the need for an electrical technician to contact a loaded electrical conductor because there are no electrical conductors in the detachable functional zone. The only conductor that needs to interact with an electrical technician is the individual lines that are isolated by the functional zone. The quarantinable functional zone of embodiments of the present invention enables a wide range of programs to be safely performed without disrupting the power to the entire system or critical loads. Such a procedure may be, for example, replacing a faulty protective device (circuit breaker or fuse combination); changing the type of circuit breaker, protection rating, phase connection, residual current device, etc.; monitoring and/or control device replacement, repair , connection, etc.; main input power to the switch between the switch and the external sub-circuit between the replacement, repair, connection, etc.; switch disk surge protection device replacement, repair, connection, etc.; connection and cut Sub-circuit, main input power supply, full rated parallel replacement input power supply, full rated output power sub-circuit, power quality analyzer, etc.; electric network design; temperature recorder measurement, fault repair, etc.; upgrade, update, increase capacity Etc.; the rapid load recovery of the critical load during a power outage, and the supply of power to the critical load by supplying a temporary switch disk.

Embodiments of the present invention can be implemented as a single final switch panel for supplying uninterrupted power to critical electrical equipment, computing equipment, communication equipment, etc. in industrial locations, factories, locations. The detachable functional zone may be, for example, a redundant subcircuit removed from the final switchboard, a new subcircuit connected to the final switchboard, a final subcircuit protection from a single phase to a three phase, a change in overcurrent rating, and the like. In addition, individually separable functional blocks can be connected or removed from the fully rated parallel alternate input power supply to the final switch panel without interrupting critical loads.

The embodiments of the present invention will be described by way of example only, and modifications may be made within the scope of the disclosed invention. For example, the detachable functional zone can be placed in or connected to one or more components of the electrical equipment within the electrical distribution system, which can be electrical switchboards, electrical devices, electrical loads, power distribution subsystems, and electrical components and electrical Facilities, etc. Electrical equipment can include an uninterruptible power system (UPS). Additionally, embodiments of the present invention may be implemented in an AC or DC power distribution system, without limitation to its voltage or current amount.

100. . . Electrical switch panel

102. . . shell

104. . . Functional compartment

106. . . Three-phase five-wire power supply conductor

108. . . Three-phase five-wire distribution conductor

110. . . T-shaped feed conductor

112. . . Isolation switch

500. . . Power distribution unit box

502. . . Distribution bus route

504. . . Isolation switch

506. . . Individually isolated function nodes

508. . . Power input node

510. . . breaker

512. . . Alternative power input/output node

514. . . Insulated power distribution compartment

518. . . Cover

520. . . Auxiliary state contact

522. . . breaker

600. . . Switch boxes

602. . . Distribution bus route

604. . . breaker

606. . . Individually isolated function nodes

608. . . Isolation switch

610. . . Power input node

612. . . Alternative power input/output node

614. . . Power distribution compartment

A. . . Main input power

B. . . Alternative input power / full rated output power

C. . . Three-phase upstream circuit breaker

D. . . Three-phase isolator

E. . . Three-phase upstream circuit breaker

F. . . Three-phase upstream circuit breaker

G. . . Three-phase upstream circuit breaker

H. . . Three-phase upstream circuit breaker

I. . . Single-phase upstream circuit breaker

J. . . Single-phase upstream circuit breaker

K. . . Single-phase upstream circuit breaker

L. . . Single phase isolator

M. . . No volt auxiliary state contact

N. . . No volt auxiliary state contact

O. . . No volt auxiliary state contact

P. . . No volt auxiliary state contact

Q. . . No volt endpoints can isolate functional zones

R. . . Isolation functional zone for metering

S. . . Monitoring / Surge Protection / Indicator Lights can be isolated from the energy supply zone

T. . . Converter can isolate the function area

U. . . Converter can isolate the function area

Reference is made to the drawings to illustrate embodiments of the invention.

1A-C are schematic views of an embodiment of a switch panel having a separate detachable functional zone of the present invention; and FIG. 2 is a schematic view of an embodiment of a switchboard having a plurality of different detachable functional zones of the present invention; FIG. B is a schematic diagram of a data center uninterruptible power system (UPS) including an embodiment of the quarantinable functional zone of the present invention; and FIG. 4 is a schematic diagram of an electric motor having a power distribution system of an embodiment of the present invention including respective detachable functional zones; 5 and 6 are front views of a power distribution unit box according to an embodiment of the present invention; FIG. 7 is a sectional perspective view of a functional compartment of the power distribution unit box of FIGS. 5 and 6; and FIGS. 8 to 10 are power distribution units of FIGS. 5 to 7. A partial circuit diagram of six functional nodes in the box for displaying a three-pole and four-pole wiring configuration; FIG. 11 is a front view of a switch gear box according to another embodiment of the present invention; and FIG. 12 is a switch disk box of FIG. Simplified circuit diagram.

100. . . Electrical switch panel

102. . . shell

104. . . Functional compartment

106. . . Three-phase five-wire power supply conductor

108. . . Three-phase five-wire distribution conductor

110. . . T-shaped feed conductor

112. . . Isolation switch

Claims (5)

A power distribution system having a plurality of individually detachable functional nodes each connected to a power distribution bus through an isolation device, the bus bar being connected to a power input node through an isolation device, wherein the power input node is connectable to a power source, wherein The power distribution busbar and the isolation device are housed in a power distribution compartment, and wherein the power input node and the functional node are accommodated in a separate manner from each other, and the power distribution compartment is located in a functional compartment adjacent thereto . The power distribution system of claim 1, wherein the power distribution bus is connected to an alternate power input/output node through an isolation device, the node being connectable to an alternate power source or power output, wherein the replacement power input/output node They are respectively housed in functional compartments adjacent to the power distribution compartment. The power distribution system of claim 1 or 2, wherein the isolation device can be an isolating switch, a circuit breaker, a fuse, or a combination thereof. The power distribution system of claim 1 or 2, wherein the power distribution compartment has a cover having a hole through which the isolation device can be individually accessed, and the function node, the power input node, and The alternate power input/output nodes can be individually separated from the power distribution bus. A power distribution system according to claim 1 or 2, wherein the power distribution compartment is housed in the power distribution unit box or the switch box together with the functional compartment.