Amendment 3 2-module enclosure or 100A DP isolator.

[Selfmade]

I have a situation where I have fitted an RCD incomer consumer unit alongside another existing RCD incomer unit to provide RCD protection for remaining circuits. I didn't fit an isolator for the two units so to turn off all power to the building you have to turn off both RCDs. I know there was a thread on here a few weeks ago about whether or not this is compliant and somone (I forget who, sorry!) posted a link to a NAPIT document that advised that this is compliant as the consumer units with their associated circuits can be regarded as separate installations. Anyway the customer now wants me to refit the old main switch from the previous MEM 3 unit I replaced (impractical and bad idea for so many reasons) in order to provide a single point of isolation (to paraphrase!). I'd like to offer to fit a new isolator (I even have a few nocking around), but I can't find an amendment 3 2-module enclosure for sale anywhere, or indeed an amendment 3 100A DP isolator - they all seem to be plastic. Anyone know of any?

 

[Selfmade]

He went for it! Got the enclosure. Now just need to check if any of the isolators I have will fit in it.

 

[Richard Burns]

Any din rail mounted isolator will fit a standard DIN rail they are all designed to align at the same height, the problem comes when you want the terminals to align with a busbar, since you have tails to fit there should be no problem.
Since you have the four module enclosure you could even fuse it down with a fuse carrier as well! (Though I do not see any point in doing that)

 

[Selfmade]

Any din rail mounted isolator will fit a standard DIN rail they are all designed to align at the same height, the problem comes when you want the terminals to align with a busbar, since you have tails to fit there should be no problem.

Thought as much but wanted to be sure . Thanks for confirming!

Since you have the four module enclosure you could even fuse it down with a fuse carrier as well! (Though I do not see any point in doing that)

Yes no need - smallest tails present are 16mm2 and the cutout is 60A. I would have bought a two module but they just have 20mm knockouts - no good for tails!

 

[Richard Burns]

Yes no need - smallest tails present are 16mm2 and the cutout is 60A. I would have bought a two module but they just have 20mm knockouts - no good for tails!

You can cut bigger holes but the space is tight for forming the tails in a two module enclosure even with a 32mm gland.