Conduit

[alwayslearning]

Can I put a romex (8/3 with ground) and a romex (14/2 with ground) in a 1" metal conduit for 8' run?
Thanks!

[joed]

No it exeeds conduit fill limits. With out doing the calc you probably need about a 2 inch conduit for that.

[alwayslearning]

No it exeeds conduit fill limits. With out doing the calc you probably need about a 2 inch conduit for that.

Thanks, I think I will run non-romex.

[Wgoodrich]

This 1" conduit, is it just a sleave protection for part of a branch circuit or an entire conduit run for the entire branch circuit? Makes a difference.

If just sleaving then conduit fill would not apply and common sense would take over for short conduit sleave protection of a part of a branch circuit. An 8/3wGrnd would be about 1/2" in diameter plus the area taken up for the 14/2 romex. Physically I doubt you could put those two cables in a 1" conduit for 8 feet in length.

If this conduit is the wiring method for the entire branch circuit then Joed is right on the money with his reply;

Now just remember is you use THHN or any other single insulated conductors then that conduit must be there to protect the entire length of those single conductors from box to box.

Good Luck

Wg

[alwayslearning]

Now just remember is you use THHN or any other single insulated conductors then that conduit must be there to protect the entire length of those single conductors from box to box
Wg

Thank you so much. It is for the entire run of a branch circuit for a washer and dryer. The cables do fit but it is tight! Apparently this is not the appropriate way so I will do it another method.

How does one transition from a run of Romex to a run of conduit?
Let's say part of the run is already established,(Romex inside the wall), but then the next part must be mounted on the drywall of an interior wall - in conduit, for protection - as you cannot access the inside of an existing wall to continue the wires. Just pigtail the wires in a junction box?

[Wgoodrich]

When a branch circiut is ran in a nonmetallic sheathed cable method such as Rmoex or SE cable then you hit an area that need protection then you may slide conduit over that section [called sleaving for protection] only covering that part of that romex cable exposed to physical damage. No conduit fill calculation is required doing this. However most often you need to use plastic bushings and connectors on the ends of that conduit where the cable enters the conduit to protect that cable from being cut by the conduit end. No splices are required just slide into the conduit then out of the conduit when needed. Seat of the pants memory tells me that it would take a 1 1/4" conduit to contain 6/3wGrnd cable without cramming and possibly damaging that cable being sleaved.

A branch circuit that has a wiring method of conduit [complete path of branch circuit start to end of line]. This means you have a completed conduit wiring method. Then conduit fill calculation must be performed limiting the conduit size. Now you mentioned 6/3wGrnd cable this cable is about 1" in diameter. Notes in Chapter 9 of the NEC says that cable must be counted in conduit fill calculation as one round cable whether flat or round and being as a single conductor for conduit fill. Then Table 4 of Chapter 9 for EMT conduit requires you not to fill more than 53% of the inside of that conduit with a single conductor. A 1" diameter single conductor would require per that table to be a 1 1/2" conduit minimum size used as a complete wiring method start to finish if EMT conduit used protecting a 6/3wGrnd nonmetallic cable.

Hope this helps

Wg

[Unregistered]

Hope this helps

Wg


You are the best, I love this site.