I recently had a product UL Listed to 1950 where the cordage
accommodated a 15A attachment plug. The product was "de-rated" to 12A from
15A following the verbiage in Clause 3.2.1. The cordage itself or any other
components down the line to the power supply were not taken into
consideration during the evaluation aside from being rated for 12A minimum.
If UL had a documented interpretation of this requirement, perhaps in their
PAG's, I would have needed components rated minimum 15A between the wall and
power supply.
********************************************
Joe Finlayson
Manager, Compliance Engineering
Telica, Inc.
734 Foster Street, Bldg. G, Suite 100
Marlboro, MA 01752
Tel: (508) 480-0909 x212
Fax: (508) 480-0922
Email: [email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, March 10, 2000 11:22 AM
To: [email protected]; [email protected]
Subject: RE: Correction factor for power supply cords.
This "interpretation" is news to me. I thought that the derating was based
on requirements of the NEC and was specifically addressing the power plug
(plug cap) itself.
Rick Busche
Evans & Sutherland
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, March 10, 2000 8:59 AM
To: [email protected]
Subject: Re: Correction factor for power supply
cords.
Kelly,
UL 1950 has a D1 (more restrictive) deviation in clause
3.2.1:
"Where equipment is intended to be connected to a source of
supply by a power
supply cord, the attachment plug shall be rated no less than
125 percent of the
rated current of the equipment."
UL's interpretation of "attachment plug" includes not only
the plug that goes
into the wall outlet, but the entire path between the wall
outlet and your power
supply, including:
* Wall plug.
* Cordage.
* IEC-320 plug.
* IEC-320 appliance inlet.
John Barnes
Advisory Engineer
Lexmark
International
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