240C Power Resistor Decade Box

Started by Crane-iac, 04-02-2014 -- 06:58:28

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Crane-iac

04-02-2014 -- 06:58:28
I can understand the need to check withstand voltage on the 240c. The newest addition to the procedure changes that test into a hipot, probably for safety reasons. If you do the math though, the procedure is looking for a current in the nano amps. Is this overkill? And can I continue to use the old procedure, maybe with a limited cal of 660v and still be following the "letter of the law"? :-D

beadwork

#1
09-13-2014 -- 06:39:27
The wires from the resistor bank pass through a rubber grommet. The rubber grommet slides in a metal slot that is attached to the case. This rubber grommet cracks and breaks when it gets old. This causes leakage current which the 660 V test looks for.

Hawaii596

#2
09-15-2014 -- 09:01:25
Good thoughts about the Clarostats.  We use a number of them, and sometimes as a load for some hipot checks.  As it is a high power decade, that stands to reason that you want it to "withstand" higher voltages.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883
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