Imperial - metric cables

[nozspark]

First post on this forum,

I have done a quick search and not come up with anything, so...

Could someone please post the imperial cable sizes and their equivalent metric sizes, current carrying capacities etc.....

Cheers

 

[pdcelec]

13th 14th or 15th edition?

 

[nozspark]

Just doing a PIR and need to know...wiring is PVC insulated and approx 40 years old..all tests come out OK
Only shocking failure was a new shower circuit (<1 monthold) which was done by a NICEIC registered co. in 6mm red/black T&E without any supp bonding, no EIC as they subsequently did a PIR which the owner wasn't happy with.
How's about that..

 

[Adam_151]

Try these for size;
1/.044 = 1.0mm.
3/.026 = 1.5mm;
7./026 = 2.5mm;
7/.036 = 4.0mm;
7/.044 = 6.0mm;
7/.053 = 10mm;
7/.064 = 16mm;
19/.064 = 25mm.

There also was a 3/.036 as well, that would carry about 15 amps.(Some electricians would wire immersion heaters with this size)

Then the 14th edition in 1966 amended 1968 gave a new set of current ratings in Table 1 as below:

1/.044 - 11A
3/.029 - 13A
3/.036 - 16A
7/.029 - 21A
7/.036 - 28A
7/.044 - 34A
7/.052 - 43A

Hope this helps

 

[nozspark]

Thanks for the speedy reply.

Since doing the PIR I think the owner want's me to upgrade the CU. Told him to get in touch with sparks who put shower in to install supp bonding first.....surprise surprise they don't want to know. Iguess that as it's in red/black they will deny all knowledge of installing it. Only prob is, it's one of the major NICEIC contractors in my area...what do you think the rest of their jobs like????????????? ferkin cowboys!!!!!!!!!

 

[securespark]

The answer to that is easy. Tell the householder to gather all their NIC paperwork together, and contact them, insisting they do the right thing and rectify the situation under warranty.


Onto cable sizes.

imperial size converts to clipped direct value

1/.044 0.97mm2 12A
3/.029 1.29mm2 15A
3/.036 1.94mm2 19A
7/.029 2.90mm2 23A
7/.036 4.52mm2 31A
7/.044 6.45mm2 37A
7/.052 9.35mm2 46A
7/.064 14.52mm2 61A
19/.044 19.35mm2 63A
19/.052 25.81mm2 75A
19/.064 38.71mm2 101A


This come straight from my 14th edition, published 1 October 1966.The figures relate to twin and multicore cables in PVC (BS2004), clipped direct.

 

[securespark]

Everything has ended up squashed together, but you can make it out, I hope.

How do you know your customer's work was done by an NIC spark, BTW?

 

[securespark]

Please remove

 

[nozspark]

That's easy,

Firstly I asked the householder who installed it and and when it was installed. He also showed me their PIR which was done on a nice RED NICEIC form...they are a major contractor in our area, so I knew that they were NICEIC without even seeing their paperwork.

As for the paperwork etc.. they only issued a PIR even though they installed the circuit (which was done in RED/BLACK btw)......we never installed it, was already there guv springs to mind. The homeowner has contacted them and they fobbed him off, don't know how....but suffice to say he now wants me to do the remedial work.