On an exterior, wet location, how do you prefer to connect the meter base to the exterior mounted disco/panelboard? If you were connecting it with a 2" conduit, what material and connectors would you use?
Lets assume single phase 240.120 service
I have not seen a pvc chase nipple. You have a source for those?
They are not a true chase nipple since there are no threads but that's what I cal them also. They are a life saver.I have not seen a pvc chase nipple. You have a source for those?
I think their usually referred to as TA's or box adapters, I don't like them all that much though, sometimes the couplings your gluing them into are shorter than the box adapter and it ends up loose which obviously is not water tight, not to mention their irreversable in case you have a brainlapse. Many municipalities require a sealing bushing or lockring of some sort even if your in the lower 2/3rd area of the 3R enclosure.You can get these anywhere. Glue it right in a coupling.
Not sure of the ergonomics, but "Code-wise", I don;t think there is a "too low"I can't see the over/under approach to installation because of the meter base height requirements and ergonomics for the disco/main panel then being too low.
As far as 312.2 is concerned, the factory knockouts in meter bases are normally below the "level of uninsulated live parts" reference in 312.2 so sealing is not required. (I've seem some base where the biggest knockout may not be fully below the lug level but the fact that the factory KOs are there it is usually confided to be)I am more specifically looking at how they are joined to comply with 312.2, last sentence in the paragraph before the exception.
I do no believe that RMC with a regular locknut on the outside and duct seal is meeting the intent of the code. Especially where it enters a concentric knock out.