scott nous apporta ses lumieres en ce 2007/11/12 09:18:
>> Never ceases to amaze me how thick 3-phase power cables appear, yet 
>> cut one open, and the wires encased in the cable aren't *that* thick, 
>> but there's a ton of "wadding" around the actual wires inside the 
>> cable. Extra fun when attempting to unplug a 3-phase device for the 
>> first time. I had no idea it had to twist-on.
> 
> Yeh, we had this oven that was 3-phase, but only something like 23A. 
> However, like you say, the cable was about 10x wider than a normal 13A 
> mains cable, so cross-section 100x bigger.  I didn't see inside the 
> cable, but I guess it was mostly shielding, armour and insulation...
> 
> 
Each individual live whire is isulated, then there is a metal mesh protection, 
then an outer protective layer. Then, there is a ground (not isolated) and 
possibly a neutral whire. The neutral is also isolated and protected by a metal 
mesh. The whole thing is paded with ropes, encassed in an additional isolating 
layer, then 1 to 5 metal mesh armouring, plus, possibly a metal sheet shelding, 
all wrapt in an outer PVC or polypropylen outer shell.
It all adds up.

-- 
Alain
-------------------------------------------------
When the bosses talk about improving productivity, they are never talking about 
themselves.

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