Thank you Kate, it reinforces my point of view, but as is often the case when
persuading others ("we always tie back and insulate, I've got a memo dated
27th August 1967 that says to"), it's easier to have a reference to an
appropriate Standard, which of course is instantly accepted ("why didn't you
say so before?").
*Sigh*
Mark
--
Mark Hone, HESS Manager
Wellman Defence Limited
Williams Road
Portsmouth, Hampshire
PO3 5FP, ENGLAND
Tel: +44 (0)23 9266 4911
Tel: +44 (0)23 9262 9239 (Direct)
Fax: +44 (0)23 9269 7864
Mobile: +44 (0)7919 047775
>>> "Kate Savo" <[email protected]> 01/04/09 15:47:12 >>>
This question was posted on Interference Technology’s forums. The following
replies are from some of our readers.
Reply #1
Reply to "what to do with spare cores?"
Ground them to the chassis or system frame, both ends.
Rationale: a floating core in a bundle does nothing good. Quite the contrary,
it may aggravate capacitive crosstalk between different wire groups in the
harness.
By grounding the un-used wires both ends, you create both an electrostatic
screen and a magnetic field cancelling loop, thus reducing both capacitive &
magnetic Xtalk.
Only caution: don't do this with equipments which are very far from each
other, like in separate buildings, with maybe different ( not interconnected)
earth rods or earth references.
Reply #2
Michel's book, EMI Troubleshooting Techniques, is excellent and very practical.
Thanks,
Kate Savo
Interference Technology Forums Editor
www.interferencetechnology.com/
484-688-0300 ext 26
[email protected]
From: Mark Hone [mailto:[email protected]]
Sent: Tuesday, March 24, 2009 10:21 AM
To: [email protected]
Subject: [PSES] Spare cores
Gentlepeople* -
Over the last forty years or so, I have seen two diametrically opposed general
guides regarding what to do with spare cores in multicore cable.
Sometimes the instructions are to "tie back and insulate, allowing sufficient
length to allow connection if necessary", sometimes "connect all spare cores
to earth".
I need to have a debate with someone regarding spare cores and I'm wondering
if anyone can help me any references from standards (military or commercial)
that might provide definitive instruction. I have searched, but have not
found anything.
With thanks in anticipation,
Regards,
Mark
* doesn't sound right, but I want to be PC
--
Mark Hone, HESS Manager
Wellman Defence Limited
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