EMT is electrical metallic tubing. In the electrical trade there are nominal sizes expressed as a standard size. To answer your question you must state the conduit size in either electrical terms or in standard size terms to get a conversion size.
For example standard size 1/2" EMT has an actual diameter size of 3/4" and the 1/2"EMT connector for the 1/2" EMT conduit needs a 7/8" hole.
Likewise with 3/4" EMT the actual outside diameter is 15/16" and the 3/4" EMT connector needs a 1-1/8" hole.
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A trade size hole for a 2-1/2" EMT conduit connector, the hole needs to be 2-7/8" in diameter. A 3" rigid conduit can also use this size hole without the lock nuts falling into the hole.
Back set for all conduit sizes is not the same. The greater the diameter of the conduit the length of back set increases. Without the diameter size of the conduit, an answer can not be given.
Depends on the size of the conduit and the size of the wire.Allowable Conduit Fill CapacitiesSize and Type Of Conduit #14 Wire #12 Wire #10 Wire 1/2" EMT 12 9 5 3/4" EMT 22 16 10 1" EMT 35 26 16 1 1/2" EMT 84 61 38 1/2" PVC 10 7 4 3/4" PVC 18 13 8 1" PVC 32 23 15 1 1/2" PVC 80 58 36
PVC is cheaper but is used differently. PVC is usually baried in ground and emt usually runs exposed. You can use PVC exposed if it is schedule 80 gray PVC electrical conduit. Schedule 40 is for under ground
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.