To all:
1: This is a one off, house HVAC application, and cost of a few diodes=20
and installation is minor
2: The driver PLC power supply is robust and not an issue. The PLC (Tri-=20
PLC) has been in service for 7 years, and has numerous relays with the=20
1n4004 diodes across the relays and has been trouble free. :) I'm adding=20
a controlled area to the PLC.
3: Mounting the diodes at the PLC terminal strips is somewhat more=20
difficult but not impossible
4: I have been using 1n4004 diodes for this application, it, just that=20
this was the first time I had relays in parallel
5: The contacts are switching 24 VAC mainly, but 120 vac not out of the=20
question, don't think I want a diode there :)
6: Mounting the diodes at each relay is easy, inexpensive, I'll go that=20
way. I was thinking more the other direction where the extras diodes=20
could be a problem.
7: The long cable is CAT-5, the twisted pairs should minimize the aerial=20
effects.

Thanks again. :)
--=20
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