I thought compression connectors with silicone would work.
Do I have to install Myers Hubs at service panel for feeder cks? It's an outdoor panel, and I thought compression connectors with silicone would work.
I thought compression connectors with silicone would work.
I think the question asked is if a Raintight connector with a Sealing washer/ring is code complaint to install a raceway entering in th top of a panel
Or do you need to use a myers type hub?
Where is the conduit entering? If it's below the live parts a standard locknut/connector would be complaint.
Sealing locknuts are only good for threaded conduit, not fittings.
Myers hubs are cheap and work just fine. If you are entering below the panel guts, just a regular compression connector rated for outdoor use will work.
At the UL website there is a question and answer section that covers different listing issues. One article was about the use of Myers hubs and emt. The UL position was that emt in a Myers hub is against the listing. The reference is UL Question Corner, May 14, 2006.
I used to use myers hubs with emt fittings, then they came up with the fittings that are supposed to be raintight with the rubber washer included.
I stopped using the myers hubs because the rubber washer should seal the opening in the enclosure.
recently went back to a job done one year ago to do some additional work and saw that many of the rubber washers were deteriorated enough that I questioned wether they were sealing the opening anymore. Now I plan to use myers hubs again and don't care if they are not listed. The testing labs can not tell me that the original install did not seal.
When they first came out with the "raintight" fittings I thought they were a joke. Sure the extra nylon ferrules in the fitting probably will keep out more water. But I don't believe are necessary unless you are talking about high pressure water maybe.
A metal raceway installed outdoors gets more water inside from condensation then it will ever get from rain. I may even be willing to bet that a set screw fitting (if it is a pretty tight fitting one) will hold out more rain than what condenses within the raceway.
Nice methhod but is it code compliant?Kwired, I just posted what the UL says, not what I think about the issue. I am in agreement with your statements, I also think the new listed RT connectors and couplings are pretty bogus in general. Yes Myers have worked great with emt for as long as I have been doing this trade, but UL says otherwise. They do testing and they have lab coats, I don't, so my opinions are of no value anywhere except the area where my shadow hits the floor. I slide slightly undersized o-rings onto emt, use standard off the shelf raintite couplings and connectors, roll the o-rings tight to the fitting and hold them in place with a dab of silicone all around. That lasts longer and works better than the listed RT connectors and couplings that cost 5 times what the regular compression couplings do. Haven't failed any inspections for doing it this way yet.....
Kwired, I just posted what the UL says, not what I think about the issue. ........... Yes Myers have worked great with emt for as long as I have been doing this trade, but UL says otherwise. They do testing and they have lab coats, ......
I used to use myers hubs with emt fittings, then they came up with the fittings that are supposed to be raintight with the rubber washer included.
I stopped using the myers hubs because the rubber washer should seal the opening in the enclosure.
recently went back to a job done one year ago to do some additional work and saw that many of the rubber washers were deteriorated enough that I questioned wether they were sealing the opening anymore. Now I plan to use myers hubs again and don't care if they are not listed. The testing labs can not tell me that the original install did not seal.
When they first came out with the "raintight" fittings I thought they were a joke. Sure the extra nylon ferrules in the fitting probably will keep out more water. But I don't believe are necessary unless you are talking about high pressure water maybe.
A metal raceway installed outdoors gets more water inside from condensation then it will ever get from rain. I may even be willing to bet that a set screw fitting (if it is a pretty tight fitting one) will hold out more rain than what condenses within the raceway.
If you use an EMT RT compression connector with a Meyers Hub you will not have a listed RT installation. This fitting combination has not been tested to be able to handle the mechanical, electrical, or environmental requirements of UL514B (and related NEC requirements).
Macmikeman - You are mis-informed as to the validity of the listing process. The tests are real, and certainly do evaluate the capability of a fitting to withstand rainy conditions. The sealing rings absolutely work - especially if there is a split gland ring. If you have a solid gland ring (like T&B's steel RT fitting), the fitting keeps the rain out as long as the installer adequately tightens the gland nut. Those fittings need a bit more pressure to deform the metal gland ring enough to make it watertight.
That is what I was pointing out, not disputing it.
Nope, sorry I am not mis-informed as to the validity of the listing, that is your assumption. I am however of the opinion that the original RT connectors served the intended purpose for decades. I have seen dedigration of the seals on new RT connectors with my own eyes. The use of Myers Hubs with emt rt connectors on 3r side and top entrys is a locally enforced issue where I am located. I have long been of the opinion that that enforcement is incorrect, and the use of the new RT connectors strait to the subject boxes without having to add a Myers is compliant to the code and the UL listing.