Cables up a riser

[dw3101]

If we theoretically run a 150mm² 4c LSF XLPE up a building riser, does it, or should it be terminated as a submain in the riser in something like a Merlin Gerin Panel Board with MCCB's or can it leave the riser and then run under the floor and be terminated directly into an ISOBAR 4c?

Just wondering whether its considered good practice or the norm to terminate as a submain on the floor, but in the riser?

 

[Chri5]

Obvious one's, is the riser designed to have terminal equipment in it, is it accessable, does it have lighting and if it's commercial- a fire dection point?

 

[dw3101]

Yeah, Theres an electrical riser and a mech riser,

This one has rising busbar trunking and the dist boards for the floor installed in here allready. Floor is metal grid, and lighting is provided.

David

 

[ricicle]

OOI why are you running a seperate cable when you already have rising main trunking?

 

[dw3101]

Because their isnt sufficient capacity on the busbar trunking, and its also going to be fed via a generator and UPS in the LV switch room, where as the busbar isnt.

HTH

David

 

[Pensdown]

You can run the cable straight into the MG DB however, you won't be able to use a 125amp mains switch as they only take a 50mm.

There are quite a few incomer options and the right solution depends on whether your cable has grown due to VD or your design current is high.

 

[dw3101]

Cable is large due to VD, however load required is 250A per phase.

Probably make sense to terminate in something like Merlin Gerin PowerPact4 and then run a more sensible sized cable to the incomer, having said that I could allways get them to look at a custom enclosure with an MCCB as the incomer.

Its not my problem to spec it though, I just want to provide recommendations on a preferred solution because if I had my choice we wouldnt be using these guys though.

 

[Pensdown]

Cable is large due to VD, however load required is 250A per phase.

having said that I could allways get them to look at a custom enclosure with an MCCB as the incomer.

MGCB2503D4P = 250amp MCCB, cable capacity 50-185mm and it mounts straight onto the Isobar4 DB.

 

[Pensdown]

Double post

 

[RF Lighting]

TP&N merlin dist board with MCCB incommer.

IIRC the tails were either 95mm² or 150mm²

 

[Pensdown]

Your picture library is better than the MG catalogue

 

[C&GStudent]

Do you have to charge your digital camera every night RF?

 

[RF Lighting]

Not far off

I seem to average 10 photos a day

Here's another!

Its an MEM M/C FCU. The fuse retaining screw has somehow been snapped off, so the fuse is held in with a matchstick.
(the fuse carrier on MEM FCUs is spring loaded)

 

[Pensdown]

Keep the photo's coming

 

[RF Lighting]

Keep the photo's coming

I have to save a few for picture of the week