Submain question

[m4tty]

Hi,

Whilst working the other day I saw a submain fed from a switchfuse. The cable used was 16mm 3 core armoured and the switch fuse protecting it was 100a. Length of run to submain was roughly 15m run above suspended ceiling.

Is this ok or should 25mm cable be used. I've looked up ccc for 16mm in osg and it's 87a I think off top of head. But think the swa can handle bit more than this but can't find it in brb. Can someone point me to correct page?

I've only done domesic and not alot of that so am looking to learn as much as possible.

Thanks for any replies.

Cheers

 

[Brian 157]

P290, table 4E4A Matty, clipped direct 110A, free air or tray 115A.

 

[PC Electrics]

Those figures are for 90C XPLE cable and single phase.

Is the cable XPLE or PVC?

Even if it is XPLE, if the accessories at each end are standard 70C items then treat cable as PVC for purposes of ccc.

Is it single or 3 phase?

 

[m4tty]

It's single phase mate. Not sure if it was PVC or xlpe

Cheers

 

[Badger]

id have still not used 16mm armoured protected by 100 amp fuse, even if its close to its loading maximum

 

[danny7299]

Just banged this into the computer for you ,

If its PVC you got to use 25mm if its Thermosetting you could get away with 16mm ( But i would still put 25mm in )

this is For 25mm PVC/PVC

Supply voltage = 230 Volts

Ib - design current = 100 Amps

Protective device type = BS1361

In - protective device rating = 100 Amps

Length of run of cable = 15 metres

Power factor = 1

Cable Type : General purpose PVC ARMOURED - Multicore

Installation Method : Single-core or Multi-core cables Fixed on (clipped direct), or spaced < 0.3 x cable diameter from a wooden or masonary wall

method C

Ambient temp = 30

 

[m4tty]

What program are you using mate and did it cost alot? Thanks for running them through

 

[danny7299]

think it cost about