In message <000001cffc76$850f8100$8f2e8300$@wellman.com>, dated Sun, 9
Nov 2014, Ronald Wellman <rwell...@wellman.com> writes:
I would like to know if anyone has had an experience where a product
actually experienced an open protective earth conductor fault after it
left the factory. If you have, what was the Root Cause?
Two cases:
- failure of weld of PE connection stud to metalwork;
- enclosure fixing screw severed PE connection in mains cable internal
to the product.
Both products were small and no excessive touch current occurred.
I ask this because there are various standards that allow you to waive
the touch current test because of the product connection means to the
building branch circuit. Because of this, I would like to know who has
actually experienced a touch current hazard and under what conditions.
Regardless of what the standard allows, I would measure and minimise
touch current, and as far as possible make the internal PE connection
secure (i.e. screw or nut and bolt, no welded stud).
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Quid faciamus nisi sit?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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