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I want to reconfigure part of our electrical system.

 

We have an existing 10m run of 6mm^2 wire that (I assume) was originally three phase, as it has three black wires and one green wire.

 

If I use one of the blacks and the white, how big a consumer unit can I safely install?

 

If I use two blacks combined, and a white and one black combined, how big a consumer unit can I safely install?

 

I will need to change/add a breaker at the existing panel, and (if I go with the double wire) I will heat-shrink the wires together inside the panel.

 

Thanks

 

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please don't be irresponsible, to go doing any mix'n'match of wire colours. Conformity with wiring 'colour' standards is done for a real reason!! 

 

Imagine poor 'next' owner who goes to touch wiring... not knowing it had been tampered with...

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Take a photo of your meter.  

 

You said 3 black and 1 green as incomer.  So, where did white come from.  Green (as in earth) is never part of the incoming supply.

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If it's 6mm2 then each core is good for about 40A, pairing up cores would be good for 60-70A (need to de-rate for grouping).

 

If you do decide to use pairs please ensure that the pairs are clearly identified with suitably coloured heatshrink or tape.

 

With pairs I'd stick a 63A MCB on the feed end and be happy.

 

EDIT If you plan to use a green core as a live conductor (L or N) then you would certainly contravene the UK, US and Aussie regs, in Thailand, almost anything goes.

 

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If it's 6mm2 then each core is good for about 40A, pairing up cores would be good for 60-70A (need to de-rate for grouping).
 
If you do decide to use pairs please ensure that the pairs are clearly identified with suitably coloured heatshrink or tape.
 
With pairs I'd stick a 63A MCB on the feed end and be happy.
 
EDIT If you plan to use a green core as a live conductor (L or N) then you would certainly contravene the UK, US and Aussie regs, in Thailand, almost anything goes.
 


I will not use the ground for N or L.

Actually, there are three blacks, a white and a green that looks larger. I’ll take a photo when I get back.

I’d be happy with 63a
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Take a photo of your meter.  

 

You said 3 black and 1 green as incomer.  So, where did white come from.  Green (as in earth) is never part of the incoming supply.

 

There is a white also. There used to be a three phase meter, but it was (I think) changed to single. I’ll take a photo when I get back

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please don't be irresponsible, to go doing any mix'n'match of wire colours. Conformity with wiring 'colour' standards is done for a real reason!! 
 
Imagine poor 'next' owner who goes to touch wiring... not knowing it had been tampered with...


We’re currently trying to straighten out what the last owner left us.

I will heat-shrink the black I want to use as neutral white.

Most of the house is all red wiring, which I will likely heat-shrink as I go along.

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Red is commonly used as L.  Just sayin.


Yes, but when you open a box and all the wires are red, it’s not likely they’re all being used as L.

The original wiring is mostly the two-wire “Romex” type and seems okay, but all subsequent wiring is suspect.

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With wire colours make a plan and stick to it, if you can use a locally recognised standard all the better.

 

Our sparks used (at my insistance) the Thai / NEC standard of black-live, white-neutral, green-earth. I let him use red for switched lives to light fittings but he ran out of red so many of the switched lives are also black. Oh-well, the best laid plans of mice.

 

Then I go and buy some 3-core flex and get:-

  • Brown, blue, green/yellow
  • Black, white, green
  • Black, white, red (I use red for ground)

 

All good fun 🙂

 

 

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Okay these are photos of the meter, which I think is a 30/100 single-phase/2-wire

The service going into the building which looks like it used to be three phase, but a couple leads are stubbed-out.

The panel & three-phase breaker I want to replace with a new c-unit

The 6mm^2 wires

The ground, which looks to have been added after the original installation.

The red wires are going to another panel I want to rewire in separate thread.

My plan is to use two blacks as L, one black and the white for N (heat-shrinked white)




Sent from my iPhone using Thaivisa Connect

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In my mind your "We're trying to undo what the previous owner did" is a joke.  If you want to undo it, then do it properly.  Get proper size wire; and, quit trying to do everything on the cheap.  The definition of stranded wire is not taking 2 wires and twisting the ends together; so they will magically carry the same amount of current that machine spun stranded wire provides.  Color coding is the least of your problems. 

Edited by kensisaket
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