On Fri, 10 Nov 2006 10:50:48 -0800, n4aeq wrote:

I need to build a portable load to carry on the roof or tower to check
transmission lines, I know for
intermitten use a resistor will stand alot more then its rated for so
does anyone know the factor
for intermitten use?

There is no formula for calculating how much you
can exceed the maximum ratings of a component.

I have found that most resistors can withstand several
times their maximum rating for brief periods. A lot
more if you submerge them in oil.

You don't want to do any high power tests while you
are up the tower or on the roof. High power = high
voltage = a long fall if you get a shock!

73, Ed. EI9GQ.

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