MC vs EMT

[don_resqcapt19]

Like I said there are 10 ways to do this. You've made some assumptions like that they'll be using heavy 2000' reels of wire instead of 500' reels. With a single raceway you certainly wouldn't have to pull in all 6 circuits at one time.

For us on commercial jobs #10 stranded homeruns in 1" or 1.25" EMT are pretty much standard.

Yep...we never bought spools less than 2500' for 10 and smaller and almost never made more than a single pull through a conduit.

 

[don_resqcapt19]

I always wondered why it’s not actually mandatory for most jobs to save on vd and wire to meet the energy efficiency they always spout about

Was it the handle ties that phased it out or those dumb afci breakers. Atleast those killed it in resi.

After the handle tie rule became code, most designers started to prohibit muliwire circuits because you had to turn off all of the hots to work on one of them.

 

[VirutalElectrician]

How far are you running these? Why not a sub panel close by? #1 or 1/0 AL is much cheaper than 6 runs of copper.

 

[LarryFine]

How far are you running these? Why not a sub panel close by? #1 or 1/0 AL is much cheaper than 6 runs of copper.

 

[lordofthisworld]

Did a comparison. What are your thoughts?

Running 6- 1P 20A circuits from panel to a box two different scenarios. Both on a trapeze rack with straps.

(6) separate 12/2 MC cables from panel to a box 100’ away


Or


(1) 1” EMT conduit(only one bend) 100’ away with 13 #10’s


I thought it would be a lot quick to run the MC cable but the hours I come up with are about the same.

Get multi circuit cable. U can run (2) sets of 12-3-3-2,meaning each MC will have 3 hots, 3 neutrals and 2 grounds.

 

[LarryFine]

Get multi circuit cable. U can run (2) sets of 12-3-3-2,meaning each MC will have 3 hots, 3 neutrals and 2 grounds.

Now we're approaching the materials cost being more than the job.

 

[AC\DC]

Get multi circuit cable. U can run (2) sets of 12-3-3-2,meaning each MC will have 3 hots, 3 neutrals and 2 grounds.

Another dumb question from me why 2 grounds?

 

[VirutalElectrician]

Another dumb question from me why 2 grounds?

Curious on that as well.

 

[Strathead]

Curious on that as well.

That is traditionally used for furniture feeds and one of the grounds is an isolated ground.

 

[lordofthisworld]

That is traditionally used for furniture feeds and one of the grounds is an isolated ground.

Well u can use this conductor for FF but each hot has its own neutral were a true FF cable has 4 hots with 1 #10 super neutral and 1 #12 neutral, 3 hots share the super neutral, the other hot goes with the #12 neutral. ya, one ground is a grounding conductor, the other is an isolated ground.

 

[kwired]

If you shared a neutral with (3) circuits each, you could use #12's and only have (9) conductors. Depending on the loads, the neutrals might be considered as non- current carrying.

If only single phase supply you still have only 6 CCC's if using MWBC's even though you would have one more neutral conductor in the run.