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Type A rcd . EICR coding ? etc

aligarjon
Hi Guys.   Not been on for a long time, just had a bit of a search and couldn't really find anything so thought i would ask and see what you all thought.


1.  Are we or will we be coding type AC rcd's if there are LED's or induction hobs, lots of electronics  etc  present.

2. How much DC leakage does it actually take to saturate an rcd and cause  problem?

3. How much does a standard LED lamp or induction hob  leak ?

If we test an AC RCD with no load and it's fine then re-test it with all LED lights, induction hobs etc turned on and it operates correctly could we then say that it is ok with a note on EICR  OR EIC if installing any of the above.  


Obviously also on an EICR if the RCD then doesn't operate with it all on it becomes a C2 ?


Any thoughts



Gary
  • 0
    Be careful what you wish for - otherwise there'll be another amendment from the Gods with a requirement to fit all installations with a Type F regardless of expense/incompatibility and everything else.
  • 0

    Posted by whjohnson on Nov 9, 2020 11:44 am


    Be careful what you wish for - otherwise there'll be another amendment from the Gods with a requirement to fit all installations with a Type F regardless of expense/incompatibility and everything else.


    Yes indeed, Well I didn't wish for surge protection to be added into the regs, but Kirsty did and I guess she's busy now selecting soft furnishings into for Barbados bolt hole!

    Does she by chance make AFDD's?

  • 0
    Not an EICR this time, but a boiler installation. Client has given me info about the boiler so I have looked up the installation manual.


    "4.2 Mains supply

    4.2.1 Electrical supply

    ...

    Type A RCDs must be employed where additional protection is required."


    This is a PITA 'cos the CU (Schneider Easy 9) has type AC RCDs. Type A ones are not in the UK catalogue, but I have contacted the manufacturer and they are available (albeit in ROI). ?
  • 0
    a boiler installation. Client has given me info about the boiler so I have looked up the installation manual. "4.2 Mains supply 4.2.1 Electrical supply ... Type A RCDs must be employed where additional protection is required."

    Does the boiler need additional protection?

    Are you wiring a new circuit?

    Seems the manufacturers instructions are just updated otherwise.
  • 0
    Funnily enough my initial question stemmed from British Gas servicing a boiler and telling the customer he needed a Type A RCD fitted as his were AC.    Not much use to you with Sneider but the Hager boards i have been using come with type A as standard.  I don't know how long that has been happening though.


    Gary
  • 0
    British Gas servicing a boiler and telling the customer he needed a Type A RCD fitted as his were AC.

    I would then say why has BG been fitting boilers for decades to circuits that may have type AC RCDs?
  • 0
    Alcomax:
    a boiler installation. Client has given me info about the boiler so I have looked up the installation manual. "4.2 Mains supply 4.2.1 Electrical supply ... Type A RCDs must be employed where additional protection is required."

    Does the boiler need additional protection?

    Are you wiring a new circuit?

    Seems the manufacturers instructions are just updated otherwise.


    No, but the cables in walls do. Granted in a utility room they could go in mini-trunking (or similar) and do without RCD protection. The CU is "high-integrity" with the non-RCD ways already spoken for, but I suppose that in principle a longer busbar could be fitted and the adjacent RCD moved along one. Either way, it's an unnecessary ballsache.


    Yes, it is a new build. CU was put in a couple of years ago.


  • 0
    As usual, a manufacturer's instruction Chris which is WRONG. Why does a boiler need a type A, in the case it requires additional protection? There are several points here. If bonding is in place to the gas or oil supply, why would the boiler require additional protection? Can THE BOILER introduce an external potential, which is not introduced by the gas/oil pipe? NO. Can the boiler produce a DC mains current? NO. Does it have a plug? NO. So what exactly does this instruction mean? It means that whoever wrote it has no idea about anything and providing faulty manufacturers' instructions should become a criminal offense both for the writer and the manufacturer with a prison sentence as the minimum on conviction as well as a hefty fine. In fact, this instruction was probably written in a country that does not have type AC RCDs available, and the boiler does not require anything any fancier than the minimum. Let's assume a TT installation. There is NO additional protection available except bonding or perhaps a number of RCDs in series. Most important there is no danger, so just what do they mean, and certainly no explanation of why a type AC is needed!


    Aligarjon, British gas should lose its electrical certification. This is again just plain wrong. It appears that very few persons understand RCDs, DC Current, or anything else.
  • 0
    No, but the cables in walls do.



    Not being facetious, honest ? but the boiler is not buried in the wall.


    Is this a case of a fear that new boiler manufacturers guarantee may be voided by their spurious "requirements" not being met?


  • 0
    How the fixed wiring is carried out is nothing to do with the boiler manufacturer. If they wish to remind the installing electrician of the Wiring Regulations they should say refer to BS7671. You may provide additional protection to the wiring with a type AC perfectly satisfactorily, can you get a DC current from the fixed wiring? Certainly NOT!  Do they give notes on the temperature rating of the cables, and instructions to not tie them to the hot pipes? I wonder why that is?

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