Correct Type-S Upfront RCD for 3Ph TT System

[suffolkspark]

The full height are too.View attachment 94649

That isn't, also you need to get upfront rcd of appropriate brand to match the 3phase db.

 

[loz2754]

That isn't, also you need to get upfront rcd of appropriate brand to match the 3phase db.

Unless it's to be installed in a separate enclosure of course.

 

[Raptor0014]

That one isn't

Just realised I grabbed the wrong one. I thought I had some large DP ones left. But it seems I only have the mini ones and this SP one.

 

[Raptor0014]

Unless it's to be installed in a separate enclosure of course.

Yep it will go into a enclosure.

There is no 3ph board. There is a 3ph supply and then each of the phases supplies a SP DB

 

[suffolkspark]

Yep it will go into a enclosure.

There is no 3ph board. There is a 3ph supply and then each of the phases supplies a SP DB

Oh sorry I misunderstood... so 3 phase head into what... 3x single phase switch fuses? Then off to each single phase board....

 

[Raptor0014]

Oh sorry I misunderstood... so 3 phase head into what... 3x single phase switch fuses? Then off to each single phase board....

From this

Into the basic 100a 3pole Isolator

then from there round tothe 2 boards below the head and the third board has a fused switch at 60A

 

[Raptor0014]

I am right is thinking it has to be a time delayed RCD upfront and not just a 100mA or 300mA?

 

[suffolkspark]

I am right is thinking it has to be a time delayed RCD upfront and not just a 100mA or 300mA?

Yes it would need to be time delayed... but looking at that, if both hager boards out of shot below the head are plastic, I'd just swap out that switch fuse for a new one and fit a 2pole 100ma type S / type A in there as that things got basic insulation hanging out it's arse anyway.

 

[Raptor0014]

Yes it would need to be time delayed... but looking at that, if both hager boards out of shot below the head are plastic, I'd just swap out that switch fuse for a new one and fit a 2pole 100ma type S / type A in there as that things got basic insulation hanging out it's arse anyway.

I've got that and a lot lot more coded on the EICR

I thought the tails needed to be protected regardless if the CU was plastic (they are)? Hence going to swap out the basic isolator and make that a 3P 100a 100mA time delayed RCD?

Or have I got that wrong?

 

[Raptor0014]

So I will use something like this (found a type A time delay) which I will put in a separate enclosure to replace that 100A isolator.

100A 4 Pole 100mA Type A Time Delay RCD

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