Electrical instalation instructions
These are the instalation instructions that come with the shower.
Para 5.1 mentions RCD Must Posted all electrical for info (sorry about delay just got back to machine it was stored on).
The installation, supply cable and circuit protection must conform with BS 7671 (IEE wiring regulations) and be sufficient for the amperage required.The following notes are for guidance only:
1 The shower must only be connected to a 230-240V ac supply. If you are installing a shower with a kilowatt rating above 9kW, it is advisable to contact the local electricity supply company.1.1 The electrical rating of the shower is shown on the rating label (Fig.3) within the unit.
2 Before making any sort of electrical connection within the installation make sure that no terminal is live. If in any doubt, switch off the whole installation at the mains supply and remove the correct fuse.
3 The shower must be connected to its own independent electrical circuit. IT MUST NOT be connected to a ring main, spur, socket outlet, lighting circuit or cooker circuit.
3.1 The electrical supply must be adequate for the loading of the unit and existing circuits.
4 Check your consumer unit (main fuse box) has a main switch rating of 80A or above and that it has a spare fuse way which will take the fuse or Miniature Circuit Breaker (MCB) necessary for the shower (Fig.4).4.1 If your consumer unit has a rating below 80A or if there is no spare fuse way, then the installation will not be straightforward and may require a new consumer unit serving the house or just the shower.4.2 You will need to contact the local electricity company. They will check the supply and carry out what is necessary.
WARNING!THIS APPLIANCE MUST BE EARTHED
Fig.3
MeterIncomingsupplyfuseMetertailsConsumerunitPull cordisolating switchShowerunitFuse orMCBRCD(can be part ofconsumer unit)80A or 100Amain switch
Fig.4
Schematic of installation circuit
Table A
MCB30/32A32A40A40A40A40/45A45Acartridgefuse30A35A35A45A45A45A45Aunit rating7.0kW7.5kW8.0kW8.5kW9.0kW9.5kW10.5kWCIRCUIT PROTECTIONElectric shower E-002-Acompany. They will check the supply and carry out what is necessary.
5 For close circuit protection DO NOT use a rewireable fuse. Instead use a suitably rated Miniature Circuit Breaker (MCB) or cartridge fuse(see Table A).
5.1 A 30mA residual current device (RCD) must be installed in all UK electric and pumped shower circuits. This may be part of the consumer unit or a separate unit.
6 A 45 amp double pole isolating switch with a minimum contact gap of 3 mm in both poles must be incorporated in the circuit.
6.1 It must have a mechanical indicator showing when the switch is in the OFF position, and the wiring must be connected to the switch without the use of a plug or socket outlet.
6.2 The switch must be accessible and clearly identifiable, but out of reach of a person using a fixed bath or shower, except for the cord of a cord operated switch, and should be placed so that it is not possible to touch the switch body while standing in a bath or shower cubicle. It should be readily accessible to switch off after using the shower.
7 Where shower cubicles are located in any rooms other than bathrooms, all socket outlets in those rooms must be protected by a 30mA RCD.
8 The current carrying capacity of the cable must be at least that of the shower circuit protection(see Table B).
8.1 To obtain full advantage of the power provided by the shower, use the shortest cable route possible from the consumer unit to the shower.
8.2 It is also necessary to satisfy the disconnection time and thermal constraints which means that for any given combination of current demand, voltage drop and cable size, there is a maximum permissible circuit length.
9 The shower circuit should be separated from other circuits by at least twice the diameter of the cable or conduit.
9.1 The current rating will be reduced if the cabling is bunched with others, surrounded by thermal loft or wall insulation or placed in areas where the ambient temperature is above 30°C. Under these conditions, derating factors apply and it is necessary to select a larger cable size.
9.2In the majority of installations, the cable will unavoidably be placed in one or more of the above conditions. This being so, it is strongly recommended to use a minimum of 10mm cabling
Table B
Note: Cable selection is dependent on derating factorsTwin and earth PVC insulated cableCurrent carrying capacityIn conduittrunking6 mm²38A10 mm²52A16 mm²69AInstalled in an insulated wall6 mm²35A10 mm²47A16 mm²63AClipped director buried in a non-insulated wall6 mm²47A10 mm²64A16 mm²85A
