Thank you one and all for your quickly delivered help on this 
subject: it has confirmed for me that our current instructions 
should remain in force, to remove the CMOS PCBs from the 
Control System whilst there's welding going on (as Ed Price 
recommended)...  just in case.

I'd especially like to thank Robert Macy for such a wonderful set 
of calculations.  I would love to do some measurements on-site, 
but I don't have access: neither can I make design changes to 
add ferrites and extra suppression - but thank you David for the 
suggestions.

Thanks again!

Regards, Mark
--
Mark Hone

  Wellman CJB Limited               Email: [email protected]
  Airport Service Road              Tel: +44 (0)2392 629239 (Direct)
  Portsmouth, Hampshire             Tel: +44 (0)2392 664911
  PO3 5PG, ENGLAND                  Fax: +44 (0)2392 697864

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