From: John Fields
Organization: Austin Instruments,Inc.
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Subject: Re: Higher loads on triac light dimmer ???
NNTP-Posting-Date: Fri, 20 Sep 2002 12:18:44 CDT
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Date: Fri, 20 Sep 2002 17:18:44 GMT
Ian Stirling wrote:
> The wires in the appliance will be sized for the current.
> The wires in the plug/socket/... may not, even though the wattage of the
> appliance might seem to indicate that they are.
> Probably completely OK with one appliance.
> Run a few of them this way, and you could run into problems.
If the wires _in_ the appliance are sized to carry 12A, then it's a
pretty safe bet that the appliance's plug and the wires leading from to
the plug to the appliance's heating element can also carry that current.
If the maufacturer has a UL label on the appliance then it's a no
brainer. Then all that's left is the receptacle in the wall, the mains
wiring itself, and the breaker. I don't know what the spec's are for
residential wiring in Oz, but if it's at least #14, which is common here
for 15A sevice, then no problem with overheating. Same for the
receptacle's spec's. I don't know what they are, but I'd be willing to
bet it's capable of carrying at least 15A. Then there's the breaker,
which needs to be able to shrug off the repetitive current peaks, and
that's going to depend on the breaker's switching characteristics since
it's going to be carrying 12A RMS. Of _course_ if he exceeds the
breaker's rating by plugging in more appliances than it can handle, it
will shut down, but that's the case anywhere.
Professional circuit designer