From: Steve Carter (scarter_at_vcnet.com)
Date: Sun Sep 29 2002 - 13:23:57 EDT
It may be a "rule-of-thumb, but not UL's.
UL (or any safety agency) tests the device at it's full nameplate
rating to verify that it complies with their applicable standards
(determined largely by internal temperature rise). Only if it
passes may it then carry the UL marking.
Periodic UL inspections of the manufacturing plant insure that
the manufacturer continues to use the materials and procedures
originally used for product certification.
(This is actually a rather complex subject, which you find out
when you do it for a living.)
Typical load may be some/any percentage of maximum rated, unless
otherwise stated. If a duty cycle less than 100% is required to
pass, then that duty cycle must be clearly stated on the device.
My hand-held tape demagnetizer/eraser (degausser) is such a device
-- 2 minutes on, 10 minutes off.
Bottom-line:
Use your 72W adapter at whatever percentage or duty-cycle you please.
It's rated for use at 100% and your TP will only draw what it requires.
++++++++++++
On Sat, 28 Sep 02 , Ed wrote, in part:
> ...
>The UL and other testing houses have a rule of thumb:
>The actual current drawn is usually one/half the labeled current.
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