Ask the UL Engineer to specify the paragraph in the standard or PAG that
backs up the demand.
Richard Woods
----------
From: Ehler, Kyle [SMTP:[email protected]]
Sent: Wednesday, August 01, 2001 9:59 AM
To: 'EMC and Safety list'
Subject: Mains fusing
Greetings,
I have a new product that includes an off the shelf UPS that is
rated for 230V ac operation and has an internal single pole circuit breaker
on the mains inlet. We want to target this product world-wide. The UPS
presently is CB and certified to EN60950 european only. For North America
we want it to have UL1950, and to obtain this, UL is demanding the breaker
be double pole.
Many of our existing products (including this new product) employ
SMPS type power supplies that are fused on the line side only, yet they are
certified to EN60950, UL1950 and CB. How can these products be acceptable
yet another cannot?
Am I missing something?
I'm confused. (no pun intended :)
Kyle
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