TP&N sub feed

[TPES]

I have a TP&N sub board to install in a commercial kitchen, usually I would be looking at supplying the SWA to the sub with a switch fuse unit, the ones I've used in the past are good but quite a big, I don't have the room for this now, so was thinking of this http://www.luckinslive.com/product/388706440/Hager-Ltd-Energy-Distribution/HMF480T?ref=388706466

What do you think?

 

[Knobhead]

There's nothing wrong with that unit. But without knowing the set up at the supply end it's hard to say.

 

[TPES]

So an 80a MCB is just as acceptable as a 80a switchfuse?

 

[Marvo]

Have you calculated the pscc? Will 10kA cover it?

 

[SYKRAPS]

Can't you fit the SFU at the origin and install a small DB in the kitchen area?

 

[TPES]

Can't you fit the SFU at the origin and install a small DB in the kitchen area?

That's is exactly what I am doing..

 

[TPES]

Yeah the breaking capacity is well within the 10ka

 

[TPES]

This 4 pole MCB would obviously be fusing the neutral too, considering all 3 phases and the neutral would disconnect at the same time does anyone see a problem with this?

 

[Engineer54]

Have you calculated the pscc? Will 10kA cover it?

Know what your thinking here, but there are standard sized (just a bit fatter) MCB's (1/2/3 and 4 pole) with breaking capacities of 25+ KA Not sure if Hager do them mind!!!

Schneider, ABB, Siemens, are the manufactures that i'm thinking about...

 

[TPES]

I've already purchased a 100a 4 pole hager MCB, 15kA, only problem being its a 4 pole MCB so the neutral will be fused if used in one of the poles, anyone see this as a problem? If this breaker disconnects, all the phases will be out

 

[electric will]

I've already purchased a 100a 4 pole hager MCB, 15kA, only problem being its a 4 pole MCB so the neutral will be fused if used in one of the poles, anyone see this as a problem? If this breaker disconnects, all the phases will be out

What if the neutral disconnects first? Is a four pole a good idea?

 

[Amp David]

Re: TP&N sub feed

I've already purchased a 100a 4 pole hager MCB, 15kA, only problem being its a 4 pole MCB so the neutral will be fused if used in one of the poles, anyone see this as a problem? If this breaker disconnects, all the phases will be out

Is this 4 pole MCB protecting the sub main your putting in then?

Discrimination between your final and supply circuits should mean that this MCB will only let go if you have a fault on the supply to your new board.

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What if the neutral disconnects first? Is a four pole a good idea?

I'd like to see that :conehead:

 

[TPES]

What if the neutral disconnects first? Is a four pole a good idea?

No not really but I can't find anyone who does a TP&N MCB 80a or 100a, 15kA.
I only have a very small space for a fused isolator but the standard 3 phase 100amp isolators are massive

 

[Amp David]

Have much have you got available?

 

[High Tower]

Just remember the hager 4poles have to go in a top mount add on module