I couldn't find a requirement either when I looked under various
standards that I have to comply with 55024 which calls out the 82-1
requirements, NEBS and some ETSI standards. I was a little more concerned
because the equipment I am looking at is actually outdoors so there will be
copper lines that don't have any primary protection and are as exposed to
lightning strikes and power cross as are AC supply lines. The lines will be
feet rather than kilometers for the AC power grid and that is beneficial but
doesn't solve it all, IMHO. However, I did decide to put transient protection
on the product regardless of a known requirement to test, but again I am in
somewhat of an unusual position. Powered by DC but up on a power pole or power
strand line. If you run across anything that requires the test from any
direct e-mail please let me know also.
Thanks
Gary
-----Original Message-----
From: Mike Hopkins [mailto:mhopk...@thermokeytek.com]
Sent: Tuesday, December 18, 2001 6:40 AM
To: 'KC CHAN [PDD]'; jb...@bb-elec.com; emc-p...@majordomo.ieee.org
Subject: RE: surges on 24VAC
Most Surge testers having ac mains couplers will also work with DC power
(some require minor options to work), so actually doing the test is pretty
easy.... Question as I read it was if it is in fact reasonable....
Mike Hopkins
Thermo KeyTek
-----Original Message-----
From: KC CHAN [PDD] [mailto:kcc...@hkpc.org]
Sent: Monday, December 17, 2001 8:49 PM
To: jb...@bb-elec.com; emc-p...@majordomo.ieee.org
Subject: Re: surges on 24VAC
I am thinking if it is possible to connect the source input to the surge
tester to a DC source, instead of the AC source, then you can apply the
surge tests to the DC input of your product.
>>> "Jennifer Banh" <jb...@bb-elec.com> 12/18/01 03:43am >>>
Hello everyone,
I am currently trying to test a product of ours that falls under
50082-1
generic standard for light industrial equipment. Our problem is that we
have a 24VAC power input port. The generic standard calls out for EN
61000-4-5 on AC power input ports. After looking at EN 61000-4-5 it seems
that it is intended for AC mains voltages, but I couldn't find anything that
says a 24VAC input is exempt from this test. I am looking for outside
opinions on whether this test is truly applicable.
Thanks,
Jennifer Banh
BTW, we already tried just testing to the spec, and failed. Any suggestions
on how to protect against this test would also be appreciated.
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