Rigid Metal bulkhead connector

[sameguy]

Ok, left pipe looks cross threaded and has more threads exposed.
Middle pipe looks threads buried in fitting, fitting not flush with box.
All pipes look like sillycone was applied, yes silly.

 

[Todd0x1]

I have run into many people who don't like this, and just as many people who don't understand, but I always try to avoid entering the tops of outdoor enclosures. Space allowing, I always call for conduits to land in the top of a pullbox set adjacent to panel, then nipple sideways from the pullbox into the side of the panel right above the bottom. Anyone else do it like this?

 

[Devin Hanes]

It's likely condensation inside the conduit, air seal the conduit at openings to keep humid air from entering and then condensing when the temperature drops.

 

[don_resqcapt19]

Is there a coupling in the vertical conduit above the enclosure? Rigid conduit couplings do not keep water out where they are installed in a vertical run. One reason why many specs prohibit top entry in wet locations.

 

[Trouyano]

Is there a coupling in the vertical conduit above the enclosure? Rigid conduit couplings do not keep water out where they are installed in a vertical run. One reason why many specs prohibit top entry in wet locations.

I’m agree... no conduits should come in from the top!


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[kwired]

It's likely condensation inside the conduit, air seal the conduit at openings to keep humid air from entering and then condensing when the temperature drops.

I was surprised to see it took 23 posts before someone mentioned condensation - it was my first thought. Those hubs don't leak as a general rule, at least not enough to be significant, more water condenses in connected raceways and drains to whatever is below than what leaks through the fittings, and on top of that it don't have to be rainy weather, condensation can happen on a daily basis in some locations rain or shine.

 

[kwired]

Do you use thread sealant for rigid threaded conduit?
Don’t that prevent conduit Continuity same like on water heater so we need to use bonding wire


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The issue at water heaters is not the thread sealing compound it is dissimilar metals causing gavalanic corrosion - therefore they often use an isolating fitting that is intentionally designed to not have continuity through the fitting.

If thread sealants caused enough isolating effects it would be pointless to make a grounding system bond to any metal piping system, unless you placed jumpers between every fitting in the piping system. All the sealants do is fill any gaps to help stop leaks and maybe add a little lubrication for threading it together, the threads in each side of the connection still jam together as you tighten it, especially when it is tapered threads, and therefore make good electrical continuity between each side of the connection.

 

[steve66]

they look like meyer's hub's to me.

But are the rubber rings installed? Or did they get lost or forgotten? There should be one on the bottom of the top part of the fitting.

And are the nuts on the bottom tight? As others have said, one doesn't look straight, which could just mean the nut isn't tightened enough.

 

[Fred B]

It Seems when field cut threaded, Article 300.6(A) indicates additional corrosion protection is required by an approved electrically conductive, corrosion-resistant compound.
STL-8 mfg by Eaton states that it is a suitable electrically conductive thread treatment to prevent corrosion and lubricant,
While not listed as a sealant may increase seal by 1). Slight gap fill, 2). Allows to get a tighter easier threading.
TALON COPPER ANTI-SEIZE Lubricant and Thread Sealant also indicates it is a conductive sealant.

 

[xformer]

Most of the Myers Hubs that I delt with had a circular gasket between the hub and the locknut to keep the wet stuff out.