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Garage wiring

Mark Mcleish

Hello

Needing  some advice. Moved into a bungalow and it has a detached large garage, CU from the house has armoured 6m cable running straight thr to the garage, I’ve just converted the garage into a snooker room and fitted new metal CU in there, containing

Axiom 80 A  RCD 80TA Main fuse… 1x B40, 2x B32, 1xB16 & 2xB6

i have 10 double sockets fitted, 1 on constantly for the fridge freezer. And a have a few oil filled radiators which I am looking for advice on how much voltage I can draw safely. Also the snooker table has underfloor heating attached to the underside of the slate which is attached to a 13 amp plug but total voltage draw is only 1000 W. And not on constantly.

Could any of the pros offer any advice on should I upgrade to 10m underground cable 

Thanks

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    What size fuse or breaker is at the supply end of that cable ? when you say 6m, I assume that is a typo and you mean 6mm squared copper cross-section  - if so buried is's max load is a touch under 50 A but will depend on cable type, and if it runs in thermal insulation or is well cooled.

    you could do worse than play with the cable calculator on-line here https://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

    If the supply end fuse or breaker is rated to protect the cable (so probably anything up to  about 40 to 45 amps) then there is no risk of anything nasty happening as you increase load, except that fuse or breaker may operate. Given the loads you describe I'd be tempted to verify the protection on the cable is close enough and then see if in practice you get problems with it tripping - I'd suggest you probably will not, and you will do yourself a far greater favour, especially with current price trends, if you use the money saved to draft proof and insulate the snooker room, rather than try to over-heat it. It is remarkable what 6 inches of polyurethane foam slab in the right places can do for an electricity bill ;-)


    Mike.

  • +1 in reply to mapj1

    Hi Mike, much appreciated for your reply. The supply fuse breaker is a old metal casing box with a 30A wired fuse, (30A 250V 30FR 22SWG MAX) it just runs under floor crawl space (waist height) then leaves the bungalow, then buried 12ft length underground bringing the cable into the garage.

    My garage has loads and loads of insulation, 50mm kingspan in between the studs then 30mm on top of that, So 80mm in total on the walls. 100mm kingspan in the ceiling and also same amount in floating floor. It was a small fortune. 
    It’s never broke the wired fuse or tripped from the new CU in the garage. just was wondering if I should upgrade the wire or put in new supply isolator. 
    Thanks Mark 

Reply
  • +1 in reply to mapj1

    Hi Mike, much appreciated for your reply. The supply fuse breaker is a old metal casing box with a 30A wired fuse, (30A 250V 30FR 22SWG MAX) it just runs under floor crawl space (waist height) then leaves the bungalow, then buried 12ft length underground bringing the cable into the garage.

    My garage has loads and loads of insulation, 50mm kingspan in between the studs then 30mm on top of that, So 80mm in total on the walls. 100mm kingspan in the ceiling and also same amount in floating floor. It was a small fortune. 
    It’s never broke the wired fuse or tripped from the new CU in the garage. just was wondering if I should upgrade the wire or put in new supply isolator. 
    Thanks Mark 

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