Splices in a NEMA 3R Enclosure
- Thread starter c_picard
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Just as conductors in raceways outdoors have to be identified as suitable for outdoor conditions (wet), so does all associated equipment, including splice blocks.
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Thanks. I'll talk to the folks at Burndy, and see if their product is "identified" for use in a damp location.
There seems to be a bit of confusion on the listing of the J-box, it is a Hoffman 3R enclosure, which is labelled as "rain proof", and the conduit connected to it is EMT w/raintight fittings. I do wonder why the interior of an enclosure that is rainproof would be considered wet.
There seems to be a bit of confusion on the listing of the J-box, it is a Hoffman 3R enclosure, which is labelled as "rain proof", and the conduit connected to it is EMT w/raintight fittings. I do wonder why the interior of an enclosure that is rainproof would be considered wet.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Condensation in the attached raceways dripping in. Or just condensation on the walls of the enclosure itself.
- Location
- Massachusetts
Where do I buy outdoor identified breakers or fuses to use in 3R panels or disconnects?
Not picking on smart here, it just seemed like the best post to quote for my question.
Exactly.
I just read through some extensive archived posts on this damp vs. wet topic. Wow, I had no idea this was so controversial.
A while back, a company I worked for had some failures of Polaris connectors due to inadequate application of anti-ox compund from the factory. These connectors were, and still are used extensively in solar PV applications. The photos of different failures have been widely circulated, and this may be the cause for concern. I now use the Burndy version of the same type of terminal block, and have for many installations with great success. This practice is so common, I never even thought that these connectors may not be suitable for the enviroment in which they are used.
It seems like moving to a direct-burial terminal is way overkill, but perhaps that is the only code-compliant method? Those are the only terminal blocks that I see rated for a wet location.
I just read through some extensive archived posts on this damp vs. wet topic. Wow, I had no idea this was so controversial.
A while back, a company I worked for had some failures of Polaris connectors due to inadequate application of anti-ox compund from the factory. These connectors were, and still are used extensively in solar PV applications. The photos of different failures have been widely circulated, and this may be the cause for concern. I now use the Burndy version of the same type of terminal block, and have for many installations with great success. This practice is so common, I never even thought that these connectors may not be suitable for the enviroment in which they are used.
It seems like moving to a direct-burial terminal is way overkill, but perhaps that is the only code-compliant method? Those are the only terminal blocks that I see rated for a wet location.
You install splices in raceways? :blink:
The interiors of raceways installed in wet locations may be considered wet locations by the NEC, but the interiors of enclosures installed in wet locations are not.
- Location
- Massachusetts
So the drain holes in a 3R enclsures are for?
Draining the water out of 3R circuit breakers.
Wouldn't these items be considered identified for use outdoors under the assembly listing... i.e. the panels or disconnects are listed for outdoor use and the breakers or fuses suitable for use within are part of the listing (though marketed and sold separately).
Thanks for not picking on me... :lol:
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
There are really only two choices when it comes to conductor insulation systems when installed in raceways Dry or Wet. It would not make any sense to refer to the inside of 'conduits' by any other descriptor.
One of the primary purposes of an enclosure is to 'provide a degree of protection' of the equipment inside the enclosure.
You may want to look into the 'test' criteria for different enclosure types.
I am aware of some of the test procedures. However, I'm not aware of any that establish the inside of a NEMA 3R rated enclosure installed outside as a dry location under the NEC.
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
I'm not aware of a requirement except as in 314.30 for handholes. Like iwire said, what about breakers, etc., where would this stop?
It seems to me that since it was made clear in the code that a raceway installed outdoors that the interior of the raceway is a wet location has led to other confusion.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
to drain the water out so it is not a wet area, just damp.
- Location
- Massachusetts
The defintion of wet does not require something to be submerged.
Even if a damp location that eliminates many items from being used.
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