From Tech Tips by Chuck Westfall (Canons director of media and consumer relations)
(Question posed by user):
I recently posted a question regarding the safe maximum sync voltage for an EOS 30D.
You addressed the safe sync voltage for a number of models, including the 20D, but I was wondering where I might be able to find published data on the safe sync voltages for the entire range of Canon cameras (or maybe just the 30D, as that's the body I'm using now).
(Answer from Chuck Westfall)
It's likely you'll never see an official list of all Canon SLRs according to this specification, because Canon Inc. (our parent company in Japan) simply doesn't do things like that.
I've been with Canon USA since 1982, so I'm in a pretty good position to know Canon Inc.'s habits.
However, I'll be happy to provide you with my unofficial list:
Canon Digital SLRs safe for TCV up to 250 volts:
EOS-1D Mark II N, EOS-1D Mark II, EOS-1Ds Mark II, EOS-1D, EOS-1Ds
EOS 30D, 20D, 5D
EOS Digital Rebel XTi, XT (400D/350D)
EOS D6000/D2000, Kodak DCS560/DCS520 (circa 1998)
EOS-DCS series (circa 1995)
Canon Digital SLRs safe for TCV up to 6 volts:
EOS 10D, D60, D30
EOS Digital Rebel (300D)
Canon 35mm SLRs safe for TCV up to 250 volts:
EOS-1V, EOS-1N, EOS-1, EOS 3
Canon 35mm and IX240 SLRs safe for TCV up to 6 volts:
EOS 650, 620, 630, RT
EOS 850, 750, 700
EOS Rebel Series
EOS Elan Series
EOS 10s, A2E, A2
EOS IX, IX Lite
T90