Two recent threads about moving a CU mentioned that an additional 100
Amp DP isolator was fitted after the meter. When is this necessary?

As my installation doesn't have one I will need to break the seal and
pull the cutout when I eventually swap my CU for a 17th edition one.

Meter is in cupboard outside, and about two meters of tails though the
porch wall to the CU.
Supply is TN-S (I think).

--
Graham.
%Profound_observation%

Graham. wrote:


Two recent threads about moving a CU mentioned that an additional 100
Amp DP isolator was fitted after the meter. When is this necessary?

It's not - it's a convenience to save pulling the cutout fuse.

As my installation doesn't have one I will need to break the seal and
pull the cutout when I eventually swap my CU for a 17th edition one.

You could install your own at that time - it's nothing more than a 100A DP
main switch (from a CU) fitted in a nice Wylex slimline housing with 4 entry
holes optimised for meter tails.


Meter is in cupboard outside, and about two meters of tails though the
porch wall to the CU.
Supply is TN-S (I think).

--
Tim Watts Personal Blog: http://www.dionic.net/tim/

"History will be kind to me for I intend to write it."