Discuss First consumer unit change. in the UK Electrical Forum area at ElectriciansForums.net
Yes you only need to test the rcd for the rcd results, that way you get a clean result. The circuit is not relevant for the rcd testDo you mean that, it test the RCD, but does not test the circuit will be protected by the RCD, or am I missing something?
i have 2 alternatives.dependent on the condition of the dNO fuse assembly, and presence of seals.Dare I ask how you managed to fit the new tails, Isolator already there???
It isn't. The cooker is on a 32a. It is in conduit for approx 1.2m then is clipped direct to the skirting board before chased into the wall to the socket (don't ask, I didn't install it! ?) Total length of the cable is approx 2.5m to the switch then approx 1.5m to the cooker terminal.Not sure I would have that 6.0 on a 40A as it is contained in conduit.
Can you give a valid reason for this.[picky]B40 first on the busbar, not last.[/picky]
Apologies my error.It isn't. The cooker is on a 32a. It is in conduit for approx 1.2m then is clipped direct to the skirting board before chased into the wall to the socket (don't ask, I didn't install it! ?) Total length of the cable is approx 2.5m to the switch then approx 1.5m to the cooker terminal.
I worked out the load as it is a 7.43kw cooker.
So taking diversity into account the 6.0 & 32A is more than sufficient as it is 10A +30% of remainder (22.3a) = 16.69a + 5A for the plug socket on the switch = 21.69A.
6mm in conduit is rated to 38A & 34A once in the wall. So it's well within spec.
The 6.0 40A is supplying the garage and that is clipped direct.?
Very tidy job - well done. BTW looking at first photo of new board did you originally have it too close to the ceiling to get the cover on ;-) Most of us have similar at some point!
I have a Fusebox board sitting here - I'm fitting one tomorrow for the first time.
I'm impressed with it so far. The cover has screw catchers, the knock outs actually knock out, and it feels very solid. It's also a nice size to replace a 6 module rewireable Wylex if space is limited.
Dare I ask how you managed to fit the new tails, Isolator already there???
[picky]B40 first on the busbar, not last.[/picky]
used to be usual to put the highest loads closest to the main switch. the reasoning being that the larger load currents didn't have to travel further along the busbar. no logic behind it, it was realised about 30 yearsa go that the electricity did not leak out proportionaelyt to the length of the busbar and this pracice was stopped along with the old wives tale of "exporting the earth".Can you give a valid reason for this.
They are all type A RCBOsNice n neat good job ??, with regards the high readings I generally find fusebox pretty consistent with the trip times unless it’s a type A then they get abit close to maximum ?
That’ll do it then....can I ask why type a on lights and cooker etc?They are all type A RCBOs
See my other post, it's not in conduit.Very good first CU change @Raptor0014 !
Also very brave to put it online as every minor detail will be examined and criticised, still I guess that is what you want for learning purposes.
@westward does have a good point about the 6mm in conduit though, on a 40A breaker. I'm never too sure which reference method takes preference though when only a very short run is in the more strict reference method.
I will add reg 521.5.1 . I believe the main earth should enter through the same hole into the CU as the line and neutral tails, to negate possible electromagnetic effects. I stand to be corrected though.
Reply to First consumer unit change. in the UK Electrical Forum area at ElectriciansForums.net
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