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Hi My sister has had an old backboiler taken out along with the fireplace that covered it and she want`s to brick up and plaster the old hole and hang a modern wall mounted fireplace. Ive heard she will need to put an airbrick in the newly covered chimney breast,why is this and is it a...

Hi Guy`s Today was at a friends and was just testing the voltage and EFLI on his TN`S supply and was getting 145v between line and neutral at the incomer. 230v reading to earth as normal but this low reading has be baffled.

Hi guys Could someone please help me with the calculations of ... 1. The fusing current (which trips the thermal side of the cb) my understanding is it`s 1.45 x the nominal setting of the device I.E 32A TYPE B would trip for overload at 1.45x32A=46.4A? 2.What do fuses to BS3036 trip at...

sorry guys & gals Anyone know the link to the 17th edition regs book...not got my copy yet and need to check up???

As most know cookers (even nearly new ones ) can cause nuisance trips on a 30mA RCD,so most cooker circuits were placed on the non RCD protected side of the split load unit but 17th Edition regs say most (if not all circuits) will need RCD protection. How do we face this problem if cookers are...

Example... Light switch cable drop from a ceiling down a wall to a recessed metal back box ive protected the cable with a length of metal capping, new regs state even in a `safe zone` metal capping will need to be earthed. QUESTION... 1.How do you earth metal capping? Is it simply relied...

How do the current ratings work on 3 phase MCB`s? If a had a C32 3 phase Mcb protecting a circuit will it protect each phase at 32amps or is it 32 amps for the whole circuit in question?

When carrying out a direct measurement of the EFLI on a lighting circuit,i was told the measurement should be taken at the furthest point from the C.U on the circuit to find the worst case reading. Now...would you say the furthest point was.... A...The rose/light fitting? OR B...The switch?

Hi guys...im a new one to these parts and im hoping to pick your brains... First off ... Question... It is made clear we should not use copper service pipes (water/gas) as a main connection to earth but when i came across an old installation the water pipe was used as the main bond to earth...