Yes, it would be possible in that case, but IR limits are mostly set
(incorrectly now) to 1 megohm or 2 megohms.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-20 00:24, Richard Nute wrote:
Hi John:
Depends on what limits are set for insulation resistance and electric
strength current.
For example, assume the insulation resistance limit is 100 megohms and
the measured insulation resistance is 10 megohms. Failure.
If the electric strength test is 3,000 volts, the current is
3,000/10,000,000 or 0.3 mA. If the current limit of the electric
strength test is greater than 0.3 mA, then pass.
Likewise, assume the insulation resistance is 100 megohms. Pass.
If a clearance (air insulation) is less than 0.5 mm, the clearance
will break down at less than 3,000 volts. Failure.
(The insulation resistance test measures only solid insulation.)
Best regards,
Rich
*From:*John Woodgate [mailto:j...@woodjohn.uk]
*Sent:* Monday, February 19, 2018 2:19 PM
*To:* ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] Insulation resistance test
Hello, Rich. This puzzles me:
Or, it can fail the insulation resistance measurement yet pass the
dielectric strength measurement.
how can that happen?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk <http://www.woodjohn.uk>
Rayleigh, Essex UK
On 2018-02-19 21:53, Richard Nute wrote:
Or, it can fail the insulation resistance measurement yet pass the
dielectric strength measurement.
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