Hi Ron:
Who am I to argue with the NEC?
Pete's assertion was that any equipment attached
to the POWER GRID was required to be certified by
a NRTL.
The point of my response was intended to say that
attachment to the power grid is NOT the driver
for whether or not equipment needs to be certified
by a NRTL.
In the USA, there are two drivers for third-party
safety certification of electrical products:
1) OSHA, Sub-part S, which invokes certification
by a NRTL.
2) Local electrical code (usually adoption of the
NEC). Acceptable certifiers are specified by
the local authority having jurisdiction for the
local electrical code.
So, since the NEC requires "listing for the purpose,"
then the driver for third-party certification of
telephone-connected equipment is the local electrical
code. Which may or may not require certification by
any NRTL, specific NRTLs, or non-NRTLs.
Attachment to the power grid is NOT the driver for
NRTL certification. Nor is attachment to the
telephone network a driver for NRTL certification.
But, for all practical purposes, attachment to the
power grid defines what equipment should be certified.
And, for all practical purposes, certification by a
NRTL satisfies both OSHA and electrical code
requirements.
And, as you have pointed out, for all practical
purposes, attachment to a telephone network defines
what equipment should be NRTL-certified. (My plain
old telephone does not have a UL or equivalent mark.)
Okay?
Best regards,
Rich
From: [email protected] [mailto:[email protected]] On Behalf Of Ron Pickard
Sent: Thursday, May 31, 2007 3:51 PM
To: [email protected]; Pete Perkins; Brian O'Connell; [email protected]
Subject: RE: 'IEC' symbol ??
Hi Rich,
You wrote:
"...For example, laptop computers do
not attach to the power grid, although their
external power supplies do attach to the power
grid. OSHA rules do not require a laptop
computer to be certified by a NRTL, but the
external power supply must be certified by a
NRTL."
Your statement would be true with laptops w/o analog modem ports, however,
Article 800-4 of the NEC states:
"800.4 Equipment. Equipment intended to be electrically connected to a
telecommunications network shall be listed
for the purpose."
I am sure that most of us are already aware of this requirement. I just
thought I'd mention it.
Best regards,
Ron Pickard
[email protected]
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