In UL2601 Clause 42.3.3) Duty Cycle - for Equipment for Continuous
operation it lists 2 ways to conclude the test a) temperature of the
windings stabilize and do not increase by more than 2 deg. C in 1 hr, or b)
2.5 hr, which ever is shorter.
UL1950 only states that; "for continuous operation, until steady conditions
are established". I haven't been able to establish what is meant by
"Steady Conditions". I was told once by a rep. of a large safety company
that it meant "no more than a 1 deg. C rise in 15 minute period". However,
since I can't find this written in the standard, I am a bit skeptical.
If anybody has a good definition of "Steady Conditions" and can point it
out to me in UL1950 or in the PAGs, I would appreciate it.
Daniel W. Mitchell
Product Safety Engineer
Condor DC Power Supplies, Inc.
P: (805) 486-4565 x323
F: (805) 483-4307
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