Electrics Question


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deem
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I have the following AC Adapter:

MODEL: JT-12V7000
INPUT: 230-240V AC 50Hz
OUTPUT:12VAC 7000mA Max:84VA

I have 8 spotlights that have 12V 20W bulbs - how many would be safe to run on it?

Anyone?
#1 at 13:33:41 - 11/04/2007
HairyArse
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I have no idea about any of this sort of stuff, sorry mate. The extent of my electrical skills is being able to wire a plug.
#2 at 14:00:00 - 11/04/2007
JimJam
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I think the answer's 4 deem (although probably not safely), but I've passed the question on to my electrical design engineer for a definitive answer.

EDIT - Definitive Answer;

I was correct - it should run four. However, our electrical designer adds a couple of sidenotes.

a) How has the adaptor been rated ? It might be rated at 84VA but running at 99 degrees C, which would be bad, or 84VA running at 40 degrees, which is better. If you have an instruction booklet it should say in there.

b) 4x20W bulbs on an 84VA adaptor should run OK but is very close (84VA=84W). If there is dimming on the bulbs then it's overloading the adaptor. If this is the case, reduce the number of bulbs on the circuit to 3.

Hope that helps.
#3 at 15:50:43 - 11/04/2007

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