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2 x Main Switches in on consumer unit

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KashBag

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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?
 
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KashBag said:
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?
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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.
 
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KashBag said:
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?
Click to expand...

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.
 
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Avo Mk8 said:
Something has to protect the cable to the garage other than the DNO's fuse (which is probably a bit over-rated for that!)
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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.
 

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Could maybe keep this in one thread, so it's easier for people providing advice to see all available information.

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davesparks said:
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.
Click to expand...
, 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?
 
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KashBag said:
, 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?
Click to expand...
[ElectriciansForums.net] 2 x Main Switches in on consumer unit
 
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My issue with this thread isn't about design aspects of combinations of isolators, it's about who is installing, testing and certifying a Part P notifiable project.......
 
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