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Topic Title: parallel pyro...
Topic Summary: running a single phase supply down 4 core pyro.
Created On: 01 October 2012 04:40 PM
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 01 October 2012 04:40 PM
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Avatar for BigRed.
BigRed

Posts: 558
Joined: 10 November 2006

50m length of pyro, 6mm 4 core needs to supply as many amps as possible to its end. there is a single phase breaker available, but can anybody see any problems running cores in parallel to up the current rating? Insulation checks out, sheath intact and glanded off. It will make the switch gear a whole lot easier, IP44 3 phase boards aren't that common! Yes, I can run it 3 phase, but ideally single is better in the present situation.
 01 October 2012 05:17 PM
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OMS

Posts: 19550
Joined: 23 March 2004

I would shave just a tad of the ratings for 3 phase, Red.

You'll have two fully loaded lines and 2 fully loaded neutrals - the equivalent in three phase assumes only 3 fully loaded conductors - ie balanced neutral

If it's PVC served, then use the right tables (covered or bare and exposed to touch) Table 4G1A

So roughly 48 x 2 = 96 x 0.9 = 86A

If you are confident no one will touch it then you could push it to 100A - it'll be bloody hot though, so be wary of what you clip it to

regards

OMS

-------------------------
Failure is always an option
 01 October 2012 05:23 PM
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BigRed

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Cheers oms, only pushing 40 /45a so should be fine. time to get the brown and blue heatshrink out.
i'll check the table for earth loop compliance, but it is tt at the load end. It's the big swa job, the cable was already run in, but I was told it was damaged, when the y found out the price of the swa, they asked me if I could use the pyro! good job it was pvc covered, has survived about 40 years!
 01 October 2012 05:30 PM
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OMS

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OK - it'll probably see a whole generation of clay throwers and paint daubers out as well - getting TB and suffering for your art is the done thing I believe -

63A down it will be fine

regards

OMS

-------------------------
Failure is always an option
 01 October 2012 05:33 PM
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BigRed

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hmm, now that opens up all sorts of possibilities....
TB? don't know yet, tests back soon...
Suffering? All the time!
Cheers!
 01 October 2012 08:07 PM
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Fm

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Is it hager vector boards that are ip55?
 02 October 2012 05:35 PM
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OldSparky

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as a matter of fact pyro will run at 100% overload with no problems
 02 October 2012 05:36 PM
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BigRed

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yea---h don't know if what it is mounted on will though...
 02 October 2012 06:25 PM
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Avatar for OMS.
OMS

Posts: 19550
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as a matter of fact pyro will run at 100% overload with no problems


It will - but terminations and sheath temperature will be a tad on the high side for most applications - and the welding wire in the fuse carrier is not the best plan either.

As a cable, it is pretty bomb proof - literally in some cases

Regards

OMS

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Failure is always an option
 02 October 2012 07:16 PM
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Avatar for OldSparky.
OldSparky

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Originally posted by: BigRed

yea---h don't know if what it is mounted on will though...





ok leave it unclipped

it does remind me when working for my old man we were doing a shopfit, we had to use whatever we could from the stores, we had to use a 16mm 4 core pyro for a sub mains instead of buying a length of armoured... bloody hell that took some bending
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