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You are right to be concerned - the actual detail is in the relevant BS but as I am retired I no longer have access have longer to the BS library to give to give you the document niumber. The current requiremnt is that if the appliance has been approved for connection by a BS 1363 - 13A plugtop...

I am surprised they did not give a choice of some topics, since this is a national exam - how could they compare am ignitor sequence for a Mars 6 rocket booster from a magnetic door lock. In the 70s I had to do a design for a multi-storey car park from main board to all aspects of lighting and...

Hopefully the sink is not bonded!! If the water pipes are plastic then it might be even better - needs a pair of Marigolds at the sink I suppose it depends on which came first - the DB or the sink

The question is very poor and looking a previous papers - "selectivity" should be "discrimination" Basically what would happen if the appliance fuse was a higher rating than the MCB. The answer is that the MCB would trip first causing the loss of the whole circuit instead of the appliance...

The 15th edition IEE regs required everything that did not move to be bonded - if it did move bond it just the same - this led to metal window frames and fireside tongs and pokers also being bonded. The 16th Ed was a complete reversal and required insulation as opposed to bonding - i.e kitchen...

No copper pipes need to be "earthed" at all as you suggest - service pipes cannot be used for earthing - Some copper pipes will need to be "bonded" Consumers gas pipe only, main CH heating & Flow and structural metalwork need to be "main bonded" Insulated water pipe inside the property does...

I agree Murdoch - we are the only civilised country who still allow a non-copper cpc such as SWA. In hazardous installations such as petrol pumps the steel armour cannot be used as the cpc. The cpc must be an internal copper core of the cable. The cable armour must be earthed at the supply end...

The incoming supply gas pipe to the meter must not be bonded to the electrical installation under any circumstances. Gas meters have an isolating insert to prevent direct electrical connection between the suppliers gas pipe and the consumers installation gas pipe. This was the result of a...

Waste of time - I had a instantaneous handwash in my garage for 18 years - I had to replace it 5 times due to freezing even with frost heater, But could not enclose heater and unit together so just had to accept losing it every so often. Make sure to have a handy stopcock to turn on and off...

Remember the cpc calculation - not all SWA cables are compliant

The socket is a 1950s unswitched Crabtree. Local authority houses used to get one unswitched 13A socket per room and the wall paper is early 1970s I used tp have it my first house but mines was better trimmed at skirting. Where is that flex going under the carpet that will be the next thing...

France was 220v and a lot of rural France is still 220v although like the UK they claim 230v harmonisation due to the percentage tolerance. Our house in Brittany was 220V or less until they re-supplied the town with new U/G HV and LV cabling removing the HV pylons and 6.0mm LV string overheads...

Really a waste of time fitting instantaneous water heaters outside, unless they are isolated and drained Oct - April or fitted in an insulated enclosure with frost protection. Hard to educate the user for this or explain the high energy bills in this financial climate

Don't even look at the pole there is nothing there which relates to or can help the consumer. There will be both HV earths and LV earths at the pole for the power company equipment only. There will be a neutral/earth connection at the LV neutral in all cases , but only for the star point. Any...

I don't know about the rest of the UK but the Scottish DNO limit is 3.8kw. Up to 3.8kw you have to NOTIFY the DNO, above that you have to APPLY and get APPROVAL as this now becomes a contract for the feed in tarriff. There is also an increased charge for exporting power to the network - I was...

WELL !! Yes 9 out of 10 for actually getting it powered up. A disclaimer of some sort needs to be issued after taking the cover off. No earthing lead, No bonding, etc This has been done by an industrial maintenance sparky who has worked with MICC but no clue about IEE regs

Thanks for pointing out the error. Yes the 15th Edition was introduced in 1981 but did not become enforceable until 1984 in order to allow jobs which been specified and started to be completed to the 14 Ed due to the major changes involved. The street distributor cable has a 400A fuse so the...

1 - You can move your conumer int to a higher level not exceeding 1.8m from floor to the highest operating device. Obviously you would upgrade to an 18th Ed consumer unit and get a test certificate. You need to remove the power company fuse to do this so you have to get a DNO appointed...

It sounds like your electrician has the best of intentions but limited knowledge or experience of the DNO and BS 7671 requirements. 1/ The DNO does not allow their fuses to protect the consumer tails or any submain. There is a dispensation for DI PVC tails up to 3m adjacent to the...

Correct - lowering cable sizes with a view to energy savings is nonsense. The design of non-domestic installations should include a percentage redundancy on cable size calculations particularly in the case of SWA which is the main choice of cable. The key issue with SWA cable is the use of...