two 6mm for bonding

[soulman]

Hi,

Seen an unusual thing today instead of a 10mm bonding conductor there were two 6mm conductors wired together. Is this o.k.???

 

[steptoe]

parallel conductors, but someone else may well be able to give you the reg.

 

[Evans Electric]

Were they just a 6mm to the gas ,say, and then to the water , using one cable.

I'm thinking if you were looking at a gas meter with two cables coming out of the floor to the clip you may think they are in paralell.

 

[soulman]

no it was definately two 6mm to the gas it was visable through its entire length.

 

[Evans Electric]

Someone wanted to get finished and had no 10 mm by the sound of it.

Whether its wrong , I doubt it , it achieves the objective of bonding the pipes , conductors are equal to 10mm , bit odd but there you go . Someone will come up with a problem .

 

[johninlondon1]

Is this allowed in BS, as there is no guarantee that all of the fault current would necessarily split evenly down both conductors .

 

[roys]

I don't see anything wrong with it, not common I agree, I can also see where johninlondon is coming from but I suppose then you could also argue the point that when a 7 strand cable is split 4 strand / 3 strand round either side of an screw on an earth clamp how can we be sure our 3 strands are getting as good a connection?

 

[AcombAndy]

523.8 Conductors in Parallel

Where ....PEN conductors are connected in parallel .... either: measures shall be taken to achieve equal load current sharing between them... (same material, same CSA, same length) and

The conductors in parallel are .... non sheathed cables ....

 

[steptoe]

mmm,

so how do they get around this in high rise flats then when they maybe have 20 or 30 or even more conductors going up the service voids,?

must have a look at that reg,

:|

---------- Post Auto-Merged at 19:30 ---------- Previous post was made at 19:30 ----------

its states in the reg " OR non-sheathed "

small word, big meaning

 

[Andy™]

523.8 only applies to 'two or more live conductors' or a PEN conductor. doesnt say anything about bonding conductors

 

[Sidewinder]

No problem IMHO

 

[PC Electrics]

No problem IMO. In fact it is likely that if you calculated it, one 6mm would work out adequate anyway (assuming this is =/<100A domestic).

 

[soulman]

thanks lads, the electrician i was with didn't even comment. he said it was fine.