Additional isolators in a separate cabinet

[1ManRiot]

Bear with me on this one:
-Incoming DNO supply (3 phase) comes into a cabinet which is fed out to two distribution boards in separate (unmanned) buildings
-Our "customer" wants a cubicle next to this (there is no more room in existing one) with 2 isolators, one for each circuit, so they can isolate one building without going into the building and without isolating both together

My concern is that this separate unit isn't the main isolator and is before the DB protection/ADS, therefore not fault protected in itself.

Is this a legitimate setup, WRT 7671?

 

[telectrix]

if i read you correct, all they want is an isolator for each CU. can't see a problem with that. all you are doing is interrupting the L and N to each CU. fault protection remains as it is now.

 

[1ManRiot]

Yeah that's right, it's just that they will be in a separate cubicle made me wonder if it was a legit way to do it, as normally they'd be directly alongside the cutout in an ideal world.

 

[telectrix]

clear labelling on each CU, as in " isolator in cabinet X " would suffice.

 

[Knobhead]

Use On Load switches as you’re switching an unknown load.

 

[telectrix]

Use On Load switches as you’re switching an unknown load.

good point.