in the UK, the requirements are in fact very woolly, and it's difficult
to find definitive information on the Web. But testing doesn't have to
be done annually, and hi-pot only in cases of repair of hired-out
equipment. Unfortunately, insulation resistance testing, with PASS
values even below 1 megohm in some cases, is included.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-08-15 17:03, Pete Perkins wrote:
All, This discussion goes around year after year.
The test results reported – especially Nute – show that
it takes dozens, maybe hundreds of hipot tests to damage adequate
insulation.
In the UK, so I hear, the gov’t safety folks expect
each piece of equipment to be hipot retested annually to demonstrate
adequate insulation. We don’t hear a large hue and cry about failing
equipment in that arena.
So from the experience and the data it is clear that
both the engineering type hipot testing and the factory routine
testing should not pose any problem to properly designed and
manufactured products.
For line connected products it is foolishness to remove
components for hipot testing. If that is being done the product is
not robust enough in the first place. This includes DC line powered
equipment since so much DC power is being installed and used in places
where it is subject to the same lighting and starting impulses
traditionally seen on AC line operated equipment.
:>) br, Pete
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