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sprottp

Gents,

Looking at an install which will include two new circuits, one for lights and another for a ring main. There is no space on existing 16th edition board and customer does not want a new 17th edition board, there is no double pole isolator before it.I am planning on Henley blocking the supply and taking a live and neutral to a new RCD 2 way unit. What's puzzling me is... As there is a requirement to have a main switch for isolation rather than using an RCD main switch as the isolator, would I install a double pole isolator external to the rcd unit to meet regs? Already explored ideas of RCBOs with a standard main switch 2 way unit but clients costs are the issue. Thanks
 
Another way to do it if you don't have any spares / only one spare in the existing board is take a supply from an MCB in the existing board to feed your new board and if necessary move a circuit from the existing board into your new board. Not always possible or practical depending on the condition of the old board and circuits.
Advantage of doing this is it all remains on the existing mainswitch and you don't have to pee about with putting henley blocks into the tails which you obviously can't isolate because nobody can break the seals (nudge nudge wink wink etc etc)
 

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