John,
It seems to me that TC 108 documents really devise surge protection
component tests rather that complete equipment tests and so miss some
hidden field gotchas.
I with Richards point about surge protection, for me the concern is the
surge current being diverted into the PE system creating local PE surge
differential voltage rises.
Multi-service surge protective devices (MSPDs) - all in one surge
protection (mitigation actually) - can cause problems here by
transferring a surge on one service, say AC mains, to another service
e.g. telephone service, because that service feed offers a better path
for the diverted surge current than the PE connection.
Equipment connected to the protected output of the MSPD should survive
the surge, but equipment connected on the unprotected side may suffer
due to the unexpected diverted surge. Solution, put and MSPD on every
bit of equipment. Looks like a win-win situation for MSPD manufacturers.
Regards,
Mick Maytum
Safety and Telecom
Standards
[email protected]
Ictsp-essays.info
------ Original Message ------
From: "John Woodgate" <[email protected]>
To: [email protected]
Sent: 16/09/2017 08:04:59
Subject: Re: [PSES] power strip details
I agree, but doesn't that also apply to surge-suppression built into
equipment? Should we stop requiring surge immunity testing on
equipment?
With best wishes DESIGN IT IN! OOO – Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England
UK is a sovereignty, not a Zollverein-ty
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