Thanks for your sharing experience!  Did you conduct the flash test that 
normally is over 1,250 Vac by that time?  Probably a megger tester is more 
portable for onsite testing than flash test as an alternative.

 

Scott

 

 

From: <n6...@comcast.net>
Date: Monday, 19 February 2018 at 2:50 PM
To: 'Scott Xe' <scott...@gmail.com>, <EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: RE: [PSES] Insulation resistance test

 

I don’t know about history, but I remember testing the insulation resistance of 
every wire in Lower Granite Lock and Dam on the Snake River the summer of 1974. 
 1000 VDC.  The specification called for 1 MOhm and we typically saw infinity.  
The whole summer we found 1 bad wire.

 

Ghery S. Pettit

 

 

From: Scott Xe [mailto:scott...@gmail.com] 
Sent: Sunday, February 18, 2018 9:46 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Insulation resistance test

 

Insulation resistance test is one of most common safety tests nowadays: Flash 
test, earth continuity test, leakage current test and insulation resistance 
test.  Can someone share the history of this teat to use DC and 500 V.  The 
products are working on AC and test voltage is higher than normal operating 
voltage but much lower than the flash test.  It is a trend to skip this test on 
production line.  What are the distinct benefits for this test?

 

Thanks and regards,

 

Scott

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