Submain cable ideas?

[allybally]

Thanks for the input, I'm already running a 10mm2 cable for a giants oven they have, and the another cable to This board to supply all the other gadgets they have, does this sound like the best way, and if I was to use 2x6mm2 is this safe to terminate into a main switch, I'm not trying to sound dumb but all I've ever done is the normal tails into switches

Thanks

 

[Guest55]

at 20mtrs long i'd want to use just 1 kitchen submains for everything including the big oven just to save on cable costs and labour time.
obviously this would probably mean a 16mm cable , but i wouldnt use 3 x 6mms , get the right cable to begin with.
is the big oven 3 phase ?

 

[allybally]

No it's only single phase, it's 8kw total electric, the cook is going to use all of the oven when cooking for all her guests, she's just bought this one to replace 2 ovens that were constantly tripping the MCB so she's defiantly hammering the oven! The manufacturer recommends a 40A dedicated circuit, so on this no diversity has been allowed

 

[telectrix]

agree with biff here. run in 2 x 6mm, use 1, keeping 1 in reserve for any future increase in load.

 

[allybally]

I've decided to run a 2 core 16mm2 armoured cable from an isolator to a new CU in the kitchen and take my cooker from there, and there will be enough for the other circuits as well, many thanks for all your advice

 

[Flanders]

As part of the installation is in trunking am I right in saying that the currently carry capacity is down to 38 amps

 

[Flanders]

Is it not cheaper to use 16mm twin and earth

 

[allybally]

Had I of used t&e it would of been trunked but I'm just going to surface it 90% and go through floor voids the other, just seamed a more practical solution and will illuminate 1 badly wired board in the main cupboard, just make it generally tidier

 

[Flanders]

As you are doing it in SWA you won't need to protect the cable with an RCD so you could fit the RCD in the new CU so if it trips out its more local to be reset

 

[allybally]

Yeah that's exactly what I've got, an isolator and a metalclad board with only 1 rcd but it's going to be 1 of 7 boards so I don't need split load, and then the whole kitchen will bo on 1 board in the kitchen, should be a tidy job in the end, just have to work through the night now to get the job done, I love working when everyone is sleeping

 

[Fin170]

Is it not cheaper to use 16mm twin and earth

Depends how you buy it, for example at TLC (where I tend to order odd lengths of cable)
16mm T&E £4.18 per meter
16mm 2 core SWA £4.43 per meter

However, calculations pending, 10mm SWA takes more than 16mm T&E and thats £3.49 per meter

So by going with the SWA you get greater capacity and don't have to worry about putting an RCD on it should the cable end up buried

 

[allybally]

I paid £110 for 25m, my boss pays the VAT, not a bad price I thought for that length of armoured, would of cost me close to that in t&e for the 2/3 runs