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Hello guys,

I'm after a bit of advice/opinion on this one.

A customer has a plumis mist sprinkler system that needs power.

I'm planning to stick in a separate unit, 100mA time delayed rcd as he wants the cables buried. If I just stick a mcb off of that would that be acceptable? It's not a TT system but it's what's suggested in the manufacturers instructions.

I'm not too clued up on time delay stuff so would appreciate any input.

Cheers
 
Hello guys,

I'm after a bit of advice/opinion on this one.

A customer has a plumis mist sprinkler system that needs power.

I'm planning to stick in a separate unit, 100mA time delayed rcd as he wants the cables buried. If I just stick a mcb off of that would that be acceptable? It's not a TT system but it's what's suggested in the manufacturers instructions.

I'm not too clued up on time delay stuff so would appreciate any input.

Cheers

For the cables to be buried at a depth below 50mm in prescribed zones you would require 30ma RCD protection
 
Doesn't have to be 100mA tbf, couldn't find a time delayed 30mA rcd so was an assumption off of left field I guess. Was going to use t and e to a fused spur from the CU and buried in the wall.


Well it needs 30mA rcd protection unless it complies with the reg I posted earlier. I would be looking at alterantive methods of installation to do away with RCD protection on a system loke this unless tye MI states it needs one.
 
Well it needs 30mA rcd protection unless it complies with the reg I posted earlier. I would be looking at alterantive methods of installation to do away with RCD protection on a system loke this unless tye MI states it needs one.

Yeah would be less hassle if he'd have it surface but doesn't want it. MI suggested time delayed rcd as only viable option if buried in wall.
 
A 30mA time delayed RCD wouldn't help as the regulation requires a standard 30mA RCD.

Some foil screened (but not all) cables comply with the requirement for an earthed metallic surround/sheath or whatever. FP200 is one example of this
 

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