Periodic Inspection Report

[ColJack]

went to one job where somone had managed to connect 2 lighting circuits together at a switch ( with a link between commons ) resulting in the need to isolate 2 breakers in the board to turn them off..

 

[GaryMo]

went to one job where somone had managed to connect 2 lighting circuits together at a switch ( with a link between commons ) resulting in the need to isolate 2 breakers in the board to turn them off..

Another good example of the intention of 314.1 and of poor workmanship.

 

[LoveRocket]

Yep, that's exactly what 314.1 is intend for.

It is NOT (and it is concerning that some pro sparks issuing PIRs think it is) saying that a radial circuit can only have one cable in the CU.

So, a 20A socket radial supplying rooms either side of the CU, thus two cables in to the CU (and obviously two lines in the MCB) = code 4, but one cable out the CU then in to a JB with two out to the rooms = correct and good practice? Nah, I don't think so.

I am still staggered that a spark would even consider two lines in to an MCB as an automatic code 4.

 

[GaryMo]

2 - The earthing arrangments are TN-S, fed with 16mm main Earthing conductor.

With a TN-S system, protective bonding conductors should be not less than half the required size of the main earthing conductor and not less than 6mm2.
If you calculate the required size of the main earthing conductor via the adiabatic equation to be 10mm2 then 6mm2 protective bonding conductors will suffice.