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 Post subject: RELT labeling
PostPosted: Mon Aug 10, 2015 8:03 am 

Joined: Mon Jun 09, 2014 9:43 am
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Is there an industry standard color or wording that should be used when installing a RELT switch :?:
Dan Collyard

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 Post subject: Re: RELT labeling
PostPosted: Sat Aug 15, 2015 3:46 pm 
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Joined: Tue Oct 26, 2010 9:08 am
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Location: North Carolina
The typical term is a "maintenance switch". Took me a minute to figure out what's what GE was talking about because it refers to "reduced let through" which typically refers to current limiting, not simply tripping faster.

There are two prevailing theories here. One is that you label the equipment with the most hazardous condition and then provide secondary documentation for operation in conditions other than worst case. The second alternative is to include both conditions in some way either with 2 separate labels or with a single label with both conditions.

There are some standards which give EXAMPLE labels but none which give a specific content or layout. There are good reasons for this because there are more than one way to skin a cat. For instance if you require "ALL" labels to have incident energy on them, what to do for the cases where the magnitude of the hazard is derived from a method other than IEEE 1584 or ArcPro or some such, such as 120 V circuits? Similarly the PPE requirements have changed about 3 times in the past 15 years and an outside contractor may have a different approach to PPE from the host plant, so PPE requirements directly on the label may not be a good idea. Finally, frequently shock hazard information is included on the same label, but it is not specifically required by NEC or other standards.

Give that under the current (2014) NEC there can be upwards of a half dozen labels or more on a cabinet, despite specific prohibitions in ANSI Z535 that NEC references against this, labelling has just about gotten completely out of control these days and it's rare that I see a cabinet anymore with LESS than 3 labels on it.

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