Flexible Conduit ground?

[sky jumper]

My village requires EMT for all interior wiring. However I know FMC is allowed for some cases as my house has whips for celing lights in the basement. Village code only says NEC 2014 + EMT required. Nothing about ground conductors for FMC.

I've heard a few different stories on this --- some say FMC whips need a separate ground conductor. Others say the whip must be less than 6 feet. one person told me the whip can be longer than 6 feet but only requires a ground conductor if over 6 ft.

I'm trying to run conduit to an exterior outlet and FMC would make it so much easier. the run is 3ft max.

 

[jchetty]

Is this a wet location? What size breaker and what size FMC. I don’t have the 2014 NEC but whoever does may need those questions answered.

For 2020 NEC, can’t be a wet location, 20 amp or smaller circuit, 1 1/4 or smaller, and you can use it for a grounding conductor if total FMC is under 6 ft.

Have you considered LFMC?

 

[wyliesdiesels]

You may be mixing up FMC/Greenfield with AC/armored cable or MC/ Metal clad cable . FMC does not have conductors in it.

MC does including a grounding conductor.

AC does not but does have a bonding strip that allows use of the jacket for grounding.

 

[alfredeneuman]

the run is 3ft max.

What's to gain by not running a ground when the run is so short?
4' of wire and a couple of screws shouldn't run more than a dollar.

 

[sky jumper]

I think I am confused by AC and MC and their applications.

The outlet is on the exterior wall of the garage. I used a metal outdoor rated outlet box in the wall which I know I didn't need but it made for a cleaner water tight install. My outside outlets on the house are loose and leak and there's no easy way to fix them without pulling off wood siding & trim, and it drives me nuts. These ones will be tight, strong, and water proof. The breaker is 20A dual AFCI/GFCI.

I bought 12/3 Steel Armored Cable, Southwire Duraclad AC. I believe it has 3 conductors black, white, red. but no green ground wire. The package says Bond Wire Ground. I'm thinking this is not what I need, unless I can use the steel cladding as the ground as with EMT?

I've got the final inspection coming up and I don't want to get dinged over the wrong flex cable.

 

[wyliesdiesels]

Why did you buy 12/3? 12/2 wouldve sufficed.

And yes as Ive previously explained, the jacket on AC cable can be used as the ground since it has a bonding strip...

 

[sky jumper]

Why did you buy 12/3? 12/2 wouldve sufficed.

And yes as Ive previously explained, the jacket on AC cable can be used as the ground since it has a bonding strip...

because I bought it long before I asked for help and I didn't know what I needed.

thanks for clearing this up.