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Thursday, April 1, 2010

Ex nr Restricted breathing

Suffix S865 - Restricted Breathing/Nonsparking Champ® Luminaires

Scroll down for Frequently Asked Questions, Termperature Data and Ordering Information!

Restricted Breathing diagram with text title2.jpg                                                                       Champ® High Intensity Discharge Luminaires up to 250-Watt Now Have a T3 Temperature Code for Use in Class I, Division 2 and Zone 2 Classified Areas Without the Need for External Seals!

Cooper Crouse-Hinds® CHAMP luminaires are now available as UL and cUL Listed, factory sealed luminaires up to 250 watts with a T3 temperature rating for National Electrical Code® and Canadian Electrical Code Class I, Division 2 and Zone 2 classification areas.

Order suffix S865 with Champ VMV, DMV and LMV luminaires for a factory sealed (restricted breathing and non-sparking) luminaire.

The factory sealed Champ luminaire prevents vapors and gases from entering the globe chamber. You receive a luminaire with a T-3 rating(200°C) that is suitable for use in Class I, Division 2 and Zone 2 areas. There are no seals, plugs or putty required reducing installation time and installation errors.

Cooper Crouse-Hinds utilizes two protection techniques to provide you a factory sealed, NEC® and CEC Class I, Division 2 and Zone 2 luminaire:

• Restricted breathing (nR) - the globe chamber is completely sealed from the ballast housing and outside air/vapors.

• Non-sparking protection (nA) - Ballast assembly components utilize non-sparking components avoiding the ignition of gases or vapors that may be present.

The overall T-code for the luminaire is established by separately determining the T-code for the globe chamber and the T-code for the ballast. The hotter of the two is taken to determine the T-code for the overall luminaire.

Currently Cooper Crouse-Hinds is the only manufacturer to offer this construction. This construction provides T3 ratings for more lamp types and more wattages than our competitors -- without the need to install external explosionproof seals. Select lamp types and wattages also have higher ambient suitability.

Certifications NEC and CEC:

Class I, Division 2 Groups A, B, C & D

Class I, Zone 2

AEx nA nR II

Ex nA nR II

UL Listed (Standards 844, 60079-15, 1598 & 1598A)

cUL Listed (Certified by UL to CSA

Standard C22.2 No. 137)

Marine & Wet Locations

Enclosure Type 3, 3R, 4, 4X, IP66


Q. How does this feature (Suffix S865) benefit me?

A. The temperature code for the luminaire will improve to T-3. T-3 temperature code is most commonly required T-code for Class I, Division 2 applications. Also, external seals are not required reducing the risk of an improperly installed seal that could lead to a hazard. Finally, the installation of a luminaire without conduit or cable seals is simpler and faster saving time and money.

By sealing off the globe chamber, the Champ luminaire prevents the ingress of gases or vapors into that area of the luminaire thereby eliminating the lamp (light bulb) surface as an ignition point for combustible gases or vapors. We utilize non-sparking components in the ballast assembly that do not exceed a surface temperature of 165°C, well below the ignition point of 200°C for T-3 code.

Q. Will I ever need just the restricted breathing (S826) option again?

A. Yes, if the application requires a T-rating that is better than T-3 (200°C) such as T-4 (135°C), then our restricted breathing option S826 (or S826TB) provides a solution. Restricted breathing seals off the ballast housing and the globe chamber moving the hottest spot to the exterior of the globe. The exterior of the globe is cooler than the globe interior or most ballast surface temperatures.

Q. Does this option affect the nameplate on the luminaire?

A. Yes! The nameplate is a UL requirement and indicates the type of protection, (A)Ex nR, provided by the luminaire and the corresponding temperature rating identified by a "T" number.

Q. Where did this form of protection come from?

A. The Zone area classification system, used throughout the world, is growing in use in North America as evidenced by article 505 (Zone classification system) of the NEC®. The Zone classification system originated from the International Electrotechnical Commission (IEC). The Zone system allows additional explosion protection methods such as restricted breathing and non-sparking. More specifically, the Zone classification method incorporates IEC explosion protection Type "n" defined in IEC 60079-15 as follows: "A type of protection applied to electrical apparatus such that, in normal operation, the electrical apparatus is not capable of igniting a surrounding explosive gas atmosphere and a fault capable of causing ignition is not likely to occur"

Equipment designed to this Zone protection method is categorized below:

Protection Method Mark Zone

Non-sparking equipment nA 2

Restricted Breathing nR 2

Flameproof d 1

Pressurization p 1 or 2

Intrinsic Safety ib 1

Increased Safety e 1

Encapsulation m 1

Powder-Filling q 1

Q. What do all those funny letters mean? AEx nA nR II T3

"A" Conformity to North American requirements

"Ex" Explosion protected

"nA & nR" protection method, see below

"II" Gas group, (Ethylene, similar to Class I, Group C)

"T3" Temperature code

See the above Protection Method table for a list of Zone protection methods.

Q. What is IEC?

A. IEC, the International Electrotechnical Commission, is an international standards and conformity assessment body covering all electrical, electronic and related technologies. They are driven by a desire to establish common standards worldwide.

Q. What about the NEC (National Electrical Code)?

A. The NEC is alive and doing well. The NEC is a document sponsored by the National Fire Protection Assoc. and provides "practical safeguarding of persons and property from hazards arising from the use of electricity. The NEC is widely used in the US for classification purposes and is driven by a desire for safe and consistent practices.

The 1996 NEC included the addition of article 505 which adopted the IEC "Zone method" as an alternative means of classifying Class I locations. NEC 505 allowed the use of IEC type explosion protection equipment in the United States. The Canadian Electrical Code (CEC) adopted the Zone classification system in 1998.

Q. How does the NEC make the link between the Division and Zone Classification systems?

A. The NEC states the following in Article 501.1: "The general rules of this Code shall apply to the electric wiring and equipment in locations classified as Class I in 500.5. Equipment listed and marked in accordance with 505.9 (C)(2) for use in Class I, Zone 0, 1, or 2 locations shall be permitted in Class 1, Division 2 locations for the same gas and with a suitable temperature class."

The NEC states in Article 505.9 Equipment (1) Division Equipment: "Equipment identified for Class I, Division 1 or Class 1, Division 2 shall, in addition to being marked in accordance with 500.8(B), be permitted to be marked with the following:

1. Class I, Zone 1 or Class I, Zone 2

2. Applicable gas classification group(s) in accordance with table 505.9(C)

3. Temperature classification in accordance with 505.9(D)(1)."

Related Info: Restricted Breathing/Nonsparking Champ® Luminaires Temperature Data and Ordering Information

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