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Reconditioned coin meter,mcb before or after?

hertzal123
Will be fitting a 60A coin meter for a 20/32A supply to greenhouses and thought it safer

to supply the meter from a garage unit rather than come off the mains isolator switch/henly block

with16/25mm tails into the meter and then into the garage unit.The meter is double insulated.Thanks for any advice.

                                                                                          Regards,Hz
  • 0
    Is this sub metering ? You'd expect some sort of fuse upstream of the meter and RCD/MCBs/ RCBOs downstream of it.

    With breakers and RCDs you have to be clear who has access to reset what - and being a greenhouse, is it TT ?
  • 0
    I have known people to rent/sub-let garages and there was an old woman somewhere else who lived in the greenhouse while her big house was on

    summer let. (I believe its called airb&b these days)

    IMO, If the coin meter is attached to a final circuit then the MCB/CB will  be upstream. As Mike has stated, its usual practice to have a cartridge fuse upstream with a MCB;/RCBO downstream covering the final circuit to provide a clear level of discrimination.

    Legh
  • 0
    The greenhouse will be TT,d locally, supplied by an overhead swa.The supply is tns.This will be a sub meter adjacent to the suppliers meter.

    I was going to fit the meter after the mcb/rcd to avoid an extra switch fuse upstream,but noticed an existing coin meter was wired straight

    from the henley block,which did,nt seem correct.

                                                                Regards,hz
  • 0
    So the coin meter is protected by the supplier's fuse, and fed via the 'real' meter ?

    OK from a safety point of view if the wiring that is only being protected only by the supplier's fuse, is rated accordingly, (no 30A tails on 100A fuse sort of thing) and the DNO may be OK with it , if the whole lot is within 3m of the service head,  but I can imagine the odd raised eyebrow - not least because it is not clear  how you are supposed to isolate it without cutting off the supply to the rest of the house. If not then a small switch fuse between Henley blocks and meter is in order.

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