Discuss 2 x Main Switches in on consumer unit in the UK Electrical Forum area at ElectriciansForums.net
Thanks, but the consumer unit in the garage has its own 100A main switch and 2 RCBOS. This on is for isolting the supply to it.I wondered if it is OK to have 2 x Main Switches in the same consumer unit. One feeding the RCBOs in the House and one feeding the CU in a garage, so that the outbuilding stuff can be isolated from the House CU?
Something has to protect the cable to the garage other than the DNO's fuse (which is probably a bit over-rated for that!)Thanks, but the consumer unit in the garage has its own 100A main switch and 2 RCBOS. This on is for isolting the supply to it.
I wondered if it is OK to have 2 x Main Switches in the same consumer unit. One feeding the RCBOs in the House and one feeding the CU in a garage, so that the outbuilding stuff can be isolated from the House CU?
oh, yes, I have allowed a 40 A mcb. Does the attached sketch make sense if practical? Second option is let the Garage Switch to be fed through the House Switch but then if I need to disconnect the outbuilding then I the house will be disconnected as well.Something has to protect the cable to the garage other than the DNO's fuse (which is probably a bit over-rated for that!)
, Yes, so a double pole mcb to isolate both the N and the L, N should be isolated as well. By using a double pole MCB I will save space (instead of the 40A MCB and the Main Switch).You should have one main switch which isolates the whole installation.
After that you can add any other means of isolation you need/want.
You can use another 2 pole switch in the CU, in addition to the fuse/MCB, to isolate the garage or you could add an isolator next to the CU, it cannot replace the fuse/MCB. You could even use a 2 pole MCB.
, Yes, so a double pole mcb to isolate both the N and the L, N should be isolated as well. By using a double pole MCB I will save space (instead of the 40A MCB and the Main Switch).
Another option is use 2 x Henley blocks to add a separate CU in the House to feed the Garage CU?
question! are the 2 additional 100A Switches fed through the main one, or are all three connected in parallel?
The main switch isolates the other two basically the same as a dual rcd cuquestion! are the 2 additiona Switched fed through the main one, or are all three connected parallel?
Cheers, it does make sense, but it is not incorrect to connect them in parallel right? Or is there a requirement to have one main disconnection point in the CU?The main switch isolates the other two basically the same as a dual rcd cu
The actual main switch must isolate everything.Cheers, it does make sense, but it is not incorrect to connect them in parallel right? Or is there a requirement to have one main disconnection point in the CU?
I was told that for years, however my house has a few, the DC isolators, the UPS isolator, the DNO isolator etc. And at work one building has at least three DNO supplies, maybe four.You should have one main switch which isolates the whole installation.
If a board is marked up as having a main switch then it should isolate that DB so that there is nothing live after that main switch.I was told that for years, however my house has a few, the DC isolators, the UPS isolator, the DNO isolator etc. And at work one building has at least three DNO supplies, maybe four.
I was told that for years, however my house has a few, the DC isolators, the UPS isolator, the DNO isolator etc. And at work one building has at least three DNO supplies, maybe four.
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