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Aluminum Spiral Flex versus Steel Spiral Flex

Posted by plumeriavine_2010 (My Page) on
Tue, Feb 23, 10 at 16:07

Trying to understand the difference between aluminum spiral flex and steel spiral flex.

Is 3/8 inch aluminum flex suitable for stud notching applications?

Is 3/8 inch steel flex suitable for stud notching applications?

Is there a price difference? When would one be used versus the other?

I am pretty sure aluminum flex was used in my kitchen. The studs were notched and the flex was put in, held in place with a bracket.

How can I tell if it is aluminum or steel and does it even matter???


Follow-Up Postings:

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RE: Aluminum Spiral Flex versus Steel Spiral Flex

3/8" flex is not generally permitted for branch circuit wiring. Are you sure that it is flex and not armored cable or metal clad cable? armored cable & MC Cable have conductors installed when the cable is manufactured. Flex is made empty and wires are installed in the field.

So the answers are no, no, yes (very little), personal preference/availability, try a magnet, if it is 3/8" flex, its a violation.


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

I am not sure of anything at this point. The walls were closed up without being inspected. The inspectors are noncomittal - they don't want to be responsible for telling the contractor to remove the backsplash and open the wall to see it.

We had never seen stud notching before, so it made an impression on us. My husband had thought it was prewired, but, then, the whole kitchen was supposedly rewired with a different gauge of wire after inspections on 12/10. There was lots of rolls of wire everywhere - I am not sure what happened there.

Is it possible to tell what the conduit/flex situation is if we remove a receptacle from the wall?

Could metal clad cable be re-wired after the walls are closed up?


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

Both MC cable and AC cable have a spiral armor and are available in steel or aluminum armor.

The NEC makes no distinction between the metal used for the armor for residential applications.

They all fall under the same installation rules and require metal plates in wood studs if they pass through a stud less than 1.25 inches from the face of the stud.

A notch would require an approved metal plate at every stud.
No protection is required between the studs.
A nail or screw would simply move the cable and not penetrate.

"There was lots of rolls of wire everywhere"

Rolls of wire or rolls of cable?

While they could have used flexible metal conduit and pulled wires after the conduit was installed, that would be an incredibly expensive way to install residential wiring.
The labor would be horrendous.

It might be best to let them finsih the work and leave.

Do NOT pay any final bill.

Hire an electrician and have them inspect, correct, and finish the job.

You can deduct the costs of re-doing incorrect wiring from any bill the GC cares to tender.

This type of thing is liable to devolve into a real fight, and even involve an attorney.

It sounds like the AHJ is at beast asleep at the switch, and at worst incompetent or has been paid off.

It might be time to talk to the head of the building inspectors.


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

Thank you, again, for helping me see through the fog. Yes- rolls of cable - - sorry - - it all seems wire-like to a non-contractor like me.

They did use the metal flex and they did seem to be rewiring it all - it took a few days and we are only talking about maybe a dozen outlets.


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

It doesn't matter WHAT he has. It's not one of the listed conduit types. It must be covered with an 1/8" steel plate. I don't know what he has. He keeps saying strap or bracket. It has to be a 1/8" steel. Plumeria it looks like a piece of metal the width of the stud and perhaps 3" or so long right?


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

The studs were notched and the flex was put in, held in place with a bracket.

The bracket is not there to hold the flex in place. It would be a lot cheaper to just use a large staple. The bracket is to protect the flex where it passes thru the stud in the notch.

Is conduit required in your area? New York, Chicago?


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

"It must be covered with an 1/8" steel plate."

1/16 thick, but they are hardened.

It is nearly impossible to drive a nail or screw through them, and even drilling is a tough job.


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Spiral Flex versus Steel Spiral Flex

Conduit isn't required AFAIK and they used Romex, to our protestations, in the laundry room. I just wish they had called an inspection so that I don't have to try to guess about it.

If it had been real electricians who had built the run, I wouldn't be so worried, but I'd still want it inspected. Since the people who did it proved to be not reliable or skilled and were nothing more than "forces" of the GC, I am a nervous wreck.

Maybe we can take away a small part of the backsplash, particularly where there had been a splice that we aren't sure was fixed, and see what lurks under there.

If we take out the receptacle boxes, can we peer into the wall well enough to figure out what the runs are made of?


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RE: Aluminum Spiral Flex versus Steel Spiral Flex

Romex is fine.

Removing a box from a wall (tiled, like yours) would be messy and difficult.


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