Henley Blocks

Hi all, looking for some clarification here. A common way of segregating garage consumer units from the house consumer unit, is to split the supply at the intake. Thus avoiding tripping the house out should the garage consumer trip. Feeding the supply in to a 100A Henley block and then feed new 25mm tails in to the house consumer unit and then run a separate feed from the Henley block to the garage unit, again 25mm tails or SWA cable. Someone has told me that we are now no longer allowed use Henley blocks to do this. Is this correct? If so, then I guess the only way to avoid unwanted tripping is to redesign the consumer unit in the house so that the breaker feeding the garage unit is not protected by the RCD, but this seems a bit of fag to me. Can anyone clarify on this please?

Many thanks,
Chris

no such lettuced. use henley blocks if you want to feed a mini CU to feed the SWA

Who,was the 'someone'?

its not anything I have ever heard of

personally i wouldn't use Henley Blocks....AND I would NEVER use a double pole one

 I always  use Lucy MLNS blocks and have enough in stock until well after I retire

Who says its not allowed ?   Just do it ,  as you probably  need a metal enclosure  to gland off your  garage cable .   Or re- configure the board . 

kerching said:

I always  use Lucy MLNS blocks and have enough in stock until well after I retire

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You're not allowed to use Lucy's  , they're against the law .     Thats the sort of thing I've  heard said . 

Or as some spark said to me once .... "you've done  two right angles AND a double set in that conduit ...thats against the law "     :C     My first introduction to the  Electric Police.  

CK Electrical said:

Hi all, looking for some clarification here. A common way of segregating garage consumer units from the house consumer unit, is to split the supply at the intake. Thus avoiding tripping the house out should the garage consumer trip. Feeding the supply in to a 100A Henley block and then feed new 25mm tails in to the house consumer unit and then run a separate feed from the Henley block to the garage unit, again 25mm tails or SWA cable. Someone has told me that we are now no longer allowed use Henley blocks to do this. Is this correct? If so, then I guess the only way to avoid unwanted tripping is to redesign the consumer unit in the house so that the breaker feeding the garage unit is not protected by the RCD, but this seems a bit of fag to me. Can anyone clarify on this please?

Many thanks,
Chris

Click to expand...

Utter garbage ................ BUT you do need an OCPD for the sub main .......... there are many ways to achieve this ..............

CK Electrical said:

then run a separate feed from the Henley block to the garage unit, again 25mm tails or SWA cable

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You cannot run a SWA cable straight from a 'Henley block ' on its own as you have to enclose the Insulated cores. So,as a minimm it would have to be in an enclosure

Tails from Henleys to switched fuse then SWA glanded off ensuring the enclosure is earthed sufficiently to comply with adiabatic.

Simplest way is a switch fuse in a metal enclosure.  Tails from Henley blocks into switch fuse. SWA to garage glanded out of the metal enclosure of the switch fuse.

EDIT: Sidney just beat me to it.

or use a mdern metal mini-CU with main switch and a suitable MCB od RCBO - usually cheaper than a switch-fuse.

binky said:

or use a mdern metal mini-CU with main switch and a suitable MCB od RCBO - usually cheaper than a switch-fuse.

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I have just bought one of SBS's boards with 9 RCBO's for house and 1 MCB for the garage to achieve exactly that, 

Everyone, many thanks for the responses, that puts my mind at rest. I always put the Henley block in an enclosure as suggested and I use the Lucy blocks for earth connection. Once again many thanks.

Kind regards,

Chris