Henley or no Henley

[maharg]

Please help I need some advice
I have been asked to replace a 9 kw shower.
The existing shower is on a Rcd board shower unit fed directly from the main consumer unit.The tails from the shower board have been fed into the supply side of the main board with the meter tails.
There is no henley block.
The esiting meter tails have been run through a concrete wall from an outside meter and run directly into the back of the consumer unit
I have tested the shower Rcd and the results show >310 on 180 degrees at x1 but all the other readings are around 7 ms.It also appears to have a cracked casing.
I have told the the customer that this Rcd needs to be changed but as it is an obscure make it would be better to change the shower unit board.

I know the customer cannot afford a complete CU change,Their current board though full has Rcd protection on sockets etc.
My questions
Is wiring the shower board from the main board within regulations or must it be from a Henley Block.

Thanks

 

[Mr Mark Sparks]

it maybe better to free up a way on the rcd side of the cu then feed off a new mcb to a small (4way cu) then feed the shower and the circuit you had to move from this

 

[Spudnik]

Indeed, although i dont see any reason not to use henlys.

Whatever you do, you really should get those extra tails out of the main cu.

 

[maharg]

Thanks Mr Mark Sparks and Jason.S
My problems is that I wont be able to purchase a new mcb for the obscure manufactured board in time I have available to upgrade the shower.
So although I would prefer to use Mark Sparks advice I think that a henley block might be the way to go.
I will have to fit new meter tails but as the existing tails are run through the wall into the back of the main CU can I run the new tails through the CU and out to the henley block and then back into the CU and connect to the main switch
The tails for the shower board obviously do not need to go through the main CU.
The existing CU is on a wall close to the ceiling and not enclosed so the tails and the henley block will be exposed.So far all the consumer units I have fitted have been in cupboards so tails and blocks have not been on show.Is this another problem.

 

[Spudnik]

Only for the customer as they will see it all.

They/you could always build a cupboard to house it all.

 

[maharg]

Just a quick question related to the RCD test.
What could make these readings occur other than a faulty RCD
1/2 0 >310
1/2 180 >310
1x 0 7.2ms
1x 180 >310
5x 0 7.0ms
5x 180 >7ms

 

[Spudnik]

Faulty RCD or leads not connected properly/tight.