New answers tagged conduit
You have to assemble it first, before wires, but putting the string in as you put it together is fine. 300.18 Raceway Installations (A) Complete Runs. Raceways, other than busways or exposed raceways having hinged or removable covers, shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors.
In the US -- the general rule is that outdoor rated cables (MC, SE, and sunlight-resistant UF are the only ones you'll see in residential work -- AC isn't allowed in damp/wet locations, nor is NM of course) can be run in the open provided they cannot be subject to physical damage -- if your cable is running anywhere where people can run into it, mow it, ...
You can run type NM cable in conduit, as long as the conduit is sized appropriately, and is not in a wet or damp location. If you remove the sheath from the conductors inside NM cable, you cannot use the conductors for anything (anything electrical anyway). Type NM cable is rated, listed, and labeled as a cable assembly. The conductors inside are not ...
Rigid conduit (which is pretty much the same thing as galvanized steel pipe) is galvanized with a considerably thicker layer than EMT - it's also stronger (emt is a bit flimsy for a railing) and more expensive (such is life.) Since you didn't specify what type of galvanized metal conduit you were considering using, what happens will vary with the type you ...
Use black pipe; it'd be better physically and aesthetically. I could tell from your neighbors yard if you used conduit but otherwise I'd have to walk up to it and then I'd say: Ooh, nice. They used black pipe. You would have to paint it though. At least consider 'sticking' with wood before you go with flimsy old EMT.
Typical EMT Type conduit will resist rust for a few years. It is however inevitable that it will rust. The most likely place for rust to start will be at the ends where it has been cut or along the surface where the finish has been scratched. I've used EMT type conduit for various types of outdoor things and had some deployments last for many years without ...
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