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Re: [APD] Help me prevent a fatal accident or injury

On 2/26/06, Jerry Baker <jerry at bakerweb_biz> wrote:
> When an insulation is given a rating of 300V for instance, does that
> refer to single layer, or to two layers side by side? I ask because the
> wires in question are encased in a round cord that appears to have been

I believe the 300V rating is the 'breakdown voltage' of the
insulations dielectric properties - by exceeding this voltage the
insulator becomes a conductor.  The amount or thickness of the
insulation probably has some bearing on this, but I don't think it
matters very much, as
I have a set of volt meter probes with 1000V insulation on them, and
the insulation itself is not very thick.

> cast around the three wires. That means there is the insulation of the
> cord as well as the wire between the outside world. Between any two
> wires are their respective insulation. That means that a voltage is
> going to have to penetrate through two layers of insulation rather than
> just one as might be the case if the bare wire was just exposed to some
> outside condition where it could penetrate one layer and find a ground.
> I don't know how those ratings work though.

My concern would be the wires shorting inside the cable, causing
damage to the ballast, the bulb or overheating of the cable, possibly
resulting in a fire.   The chances of external electrocution are
fairly small, provided you're not holding onto the cables on a 24/7


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