IAEI UL Question Corner Tamper-Resistant and Weather ...

[Pages:2]I A E I UL Question Corner

Tamper-Resistant and Weather-Resistant

Receptacle Markings

Section 406.11 of the 2008 National The Guide Information for (RTRT) states that "Re-

Electrical Code (NEC) requires receptacles ceptacles for use in wet and damp locations in accor-

installed in dwelling units to be tamper- dance with Article 406 of the NEC are identified by the

resistant. How are Listed tamper-resistant words "Weather Resistant" or the letters "WR" where

receptacles identified?

they will be visible after installation with the cover plate

secured as intended." Weather-resistant receptacles are

Tamper-resistant receptacles are Listed un- also available as tamper-resistant receptacles.

der the product category Receptacles for Plugs Ground-fault circuit-interrupter (GFCI) receptacles

and Attachment Plugs, (RTRT), located are Listed under the category Ground-Fault Circuit Inter-

on page 284 in the 2007 UL White Book or on UL's rupters (KCXS), located on page 170 in the 2007 White

Online Certification Directory at data- Book, or on UL's Online Certification Directory at

base and enter RTRT at the category code search. The database and enter KCXS at the catego-

Guide Information for RTRT will be updated in the ry code search. GFCI receptacles are also available in

2008 White Book to reflect the requirements in dwell- weather-resistant receptacles as well as weather-resistant

ing units as indicated below.

and tamper-resistant receptacles.

The Guide Information for RTRT online states,

"Tamper-resistant receptacles are receptacles for use in

A standard 20-amp rated duplex recep-

dwelling units in accordance with the NEC, specifically

tacle has a NEMA 20-A polarized configu-

Section 210.52, or in pediatric patient care areas in accor-

ration, however, some ground-fault circuit-

dance with Article 517 of the NEC, and are identified by

interrupter (GFCI) receptacles that carry a

the words ``Tamper Resistant'' or the letters ``TR'' where rating of 20 amps are provided with a 15-A NEMA

they will be visible after installation with the cover plate configuration receptacle. Can you tell me why the

removed." Tamper-resistant receptacles may be of the GFCI is not the same?

general-grade, hospital-grade or isolated-ground type.

Ground-fault circuit interrupters are Listed

In the 2008 NEC, Section 406.8(A) and

under the category of the same name with the

(B) require receptacles installed in damp or

category code (KCXS) located on page 170 in

wet locations to be weather-resistant. How the 2007 UL White Book. Ground-fault circuit-inter-

will these be identified? Are they also avail- rupter receptacles are evaluated for compliance with the

able in GFCI receptacles?

Standard for Safety for Ground-Fault Circuit Interrupt-

ers, UL 943. Presently, UL 943 addresses GFCI ratings in

Weather-resistant receptacles are Listed terms of their contact rating. Since the NEC permits all

under the category Receptacles for Plugs and 15-ampere receptacles to be used on 20-A branch circuits,

Attachment Plugs, (RTRT), located on page the contacts are required to be rated at 20 amps since they

284 in the 2007 UL White Book. The UL Guide In- open the downstream portion of the branch circuit con-

formation for RTRT in the 2007 White Book does not nected to the load terminals. The Standard requires the

include the marking information for weather-resistant contact rating to be marked on the GFCI so that even if

receptacles; however, the information is available on the receptacle is a 15-A configuration, it will still have a

UL's Online Certification Directory at da- 20-amp rating. Some manufacturers mark the devices

tabase and enter RTRT at the category code search.

20-A, 15-A receptacle.



. January February 2008 IAEI NEWS 83

I A E I UL Question Corner

I encountered some wire that was surface of the wire. Recognized components are prod-

marked AWM and was marked with a style ucts that are incomplete in constructions or evaluated

number, yet there was no type marking on on a limited basis and are not intended for field instal-

the insulation that is mentioned in Article lation, they are intended for factory installation in an

310 in the NEC. What is AWM and can I use it for overall Listed product, where the Listing engineer of

field wiring and comply with the NEC?

the equipment evaluates the suitability of the type of

wiring for the intended use.

AWM is an acronym for Appliance Wir- AWM is not identified in the NEC and is not in-

ing Material. AWM conductors are UL rec- tended for field installation in accordance with the

ognized component wires evaluated for spe- NEC. Conductors identified as AWM may also be

cific uses. Each style number has a specific use. The use identified as a Listed building type conductor if eval-

statement is found on the style page. The AWM style uated for both sets of requirements and dually rated.

pages can be located on UL's Online Certification Di- If the conductor is dually rated then it can be in-

rectory at database and select Appliance stalled in accordance with the NEC for the specific

Wiring Material (AWM) from the Specific Searches building type conductor identified on the conductor

menu. The style number is optionally printed on the insulation.

. 84 IAEI NEWS January February 2008



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