I'm somewhat familiar with the use of different electrical metal
conduits (e.g. RMC and EMT), but I'm wondering what additional
procedures are required when making up connections outdoors. A few
1) For an overhead connection to a box (enclosure), a hub is typically
held onto the top of the box by 4 screws. Is the mating of the two
metal surfaces raintight, or is an additional washer or silicone
needed between the two surfaces?
2) For a threaded RMC connection, is any silicone or other thread
3) When making an RMC connection to a knockout at the bottom of a box
(enclosure), is the use of two locknuts sufficient, or is a
different termination fitting required?