Ask The Trades - 2nd shed sub CU, main switch required?

Welcome, Guest. Please Login or Register

	Apr 6^th, 2026, 7:24am
View recently thanked users View top thanked users

Quote: Why don't they just make mouse-flavored cat food?

Ask The Trades › DIY Forum › Electrical Questions › 2nd shed sub CU, main switch required?

(Moderator: Lectrician) - (Moderator Group: Board Moderator)

< Previous Topic | Next Topic >

Pages: 1

2nd shed sub CU, main switch required? (Read 3824 times)

MikeGB

GDPR opt-out

2nd shed sub CU, main switch required?
Jun 12^th, 2009, 10:03am

Shed 1 has 6mm swa from 40 Amp mcb (non rdc side) in house CU into shed 1 CU main 40 amp 30mA 2 pole rcd protecting all sub circuits.

32 amp mcb in shed 1 CU feeds to shed 2 via 6mm swa into 4 way enclosure with 3 ways used 2 x 6 amp and 1 x 16 amp mcb's.

Do the regs require to have a double pole means of isolation in this 2nd shed or can I just attach an "Isolate elswhere" label to the adaptable box that the swa enters the enclosure via?

I dont think it makes much difference but the sheds are right next to each other.

IP Logged

Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: 2nd shed sub CU, main switch required? Reply #1 - Jun 12^th, 2009, 11:15am It is a difficult one to call in some respects. For the price of a dinrail mount double pole isolator, I would fit one anyway.
Back to top	Need to post a picture? Click HERE for info! IP Logged

MikeGB GDPR opt-out Total Thanks: 109 For This Post: 0	Re: 2nd shed sub CU, main switch required? Reply #2 - Jun 12^th, 2009, 11:52am Well if it was that simple I may have just done that but the enclosure is 4 ways (singles) so with 3 used its a case of a new enclosure as a switch will take 2 ways. No requirement under 17th that you know of that says you must have the switch then? If so I will just go with the label.
Back to top	IP Logged

Y3 GDPR opt-out Total Thanks: 109 For This Post: 0	Re: 2nd shed sub CU, main switch required? Reply #3 - Jun 12^th, 2009, 5:48pm Your point of isolation is effectively the main switch, or the 32a CB in shed one?
Back to top	« Last Edit: Jun 12^th, 2009, 6:23pm by cosbycarl » IP Logged

MikeGB GDPR opt-out Total Thanks: 109 For This Post: 0	Re: 2nd shed sub CU, main switch required? Reply #4 - Jun 12^th, 2009, 7:22pm The point of isolation for shed 2 would be either via the supplying 32amp mcb in Shed 1 (live feed only) or via the main switch in Shed 1 (both poles)
Back to top	IP Logged

Pages: 1

(Moderator: Lectrician) - (Moderator Group: Board Moderator)

< Previous Topic | Next Topic >

Ask The Trades › DIY Forum › Electrical Questions › 2nd shed sub CU, main switch required?