tie wire supports

[PrimaryElectric]

32 units roughed with MC supported by tie wire to the metal studs and the inspector says "no tie wire, must use CJ's". Is tie wire an approved method of supporting MC cable to metal studs?

 

[petersonra]

32 units roughed with MC supported by tie wire to the metal studs and the inspector says "no tie wire, must use CJ's". Is tie wire an approved method of supporting MC cable to metal studs?

Approved. Acceptable to the authority having jurisdiction.

I guess you would need to get a ruling from the AHJ to determine if this is an approved method. I don't see it as a problem.

(C) Supporting. Unless otherwise provided, cables shall
be supported at intervals not exceeding 1.8-m (6-ft)
Horizontal runs of Type MC cable installed in wooden
or metal framing members or similar supporting means
shall be considered supported and secured where such support
does not exceed 1.8-m (6-ft) intervals.

For horizontal applications i don't see you need anything to secure them at all.

 

[roger]

32 units roughed with MC supported by tie wire to the metal studs and the inspector says "no tie wire, must use CJ's". Is tie wire an approved method of supporting MC cable to metal studs?

Unfortunately, your AHJ or inspector gets to approve or dissaprove tie wire.

330.30 Securing and Supporting.

(A) General. Type MC cable shall be supported and secured by staples, cable ties, straps, hangers, or similar fittings or other approved means designed and installed so as not to damage the cable.

Tie wire is not specifically stated.

Roger

 

[petersonra]

Unfortunately, your AHJ or inspector gets to approve or dissaprove tie wire.

The inspector does not get to make that choice. Only the AHJ can do that and the inspector is NOT the AHJ.

 

[dana1028]

MC through metal stud framing

MC through metal stud framing

32 units roughed with MC supported by tie wire to the metal studs and the inspector says "no tie wire, must use CJ's". Is tie wire an approved method of supporting MC cable to metal studs?

Is your MC running through the metal studs? If so, per 330.30(C) the metal framing member is support enough, it does not need further securing. [Comment from NEC Handbook says cable ties are not needed when MC is run in this manner].

 

[roger]

The inspector does not get to make that choice. Only the AHJ can do that and the inspector is NOT the AHJ.

Bob, it depends on where you are, in some locals the inspector can in fact be the AHJ or vice versa.

Authority Having Jurisdiction (AHJ). An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure.

Roger

 

[PrimaryElectric]

The tie wire is used for vertical runs. It is the city of Hollywood, FL.

 

[petersonra]

Bob, it depends on where you are, in some locals the inspector can in fact be the AHJ or vice versa.


Roger

That is not the norm though, although they are often treated that way.

 

[roger]

That is not the norm though, although they are often treated that way.

I agree.

Roger

 

[roger]

The tie wire is used for vertical runs. It is the city of Hollywood, FL.

The inspector probably has you. I know this won't make you feel any better but, we are allowed to use tie wire here.

Roger

 

[Pierre C Belarge]

Tie-wire has been used to support/secure AC/BX cable long before "cableties" were available. I do not see the reason why so many get upset over the use of tie-wire.

 

[SmithBuilt]

I agree Pierre.

To me tie wire is better than cable ties. When done properly. Especially in a fire.

 

[crossman]

I agree also. Not being able to use tie wire for this application is ridiculous, IMSO.

 

[iwire]

I agree also. Not being able to use tie wire for this application is ridiculous

Ditto. I have had to demo jobs done with tie wire, it holds very well.

But the issue might be the 1.25" set back required, that would be why you might have to use CJ-6s 330.17 / 300.4

32 units roughed with MC supported by tie wire to the metal studs and the inspector says "no tie wire, must use CJ's". Is tie wire an approved method of supporting MC cable to metal studs?

 

[augie47]

this logic probably won't help since it may be a case of "my mind is made up, don't confuse me with facts" but since 330.30(D) allows it to be unsupported when fished, next month, after the rock is on, you could fish it thorough the same cavity without support. Kinda makes the type of support used now seem a little insignificant.

 

[POWER_PIG]

I only had one inspector that gave me greif using tie wire, (volusia co. Fla)
He said it had to be stainless steel wire and he would allow it.....I said phooey with that and whupped out the nylon wire/cable ties. Bottom line is,,,,,sometimes when the ahj starts splitting hairs its the customer that gets the crappier install.

 

[brett711]

if your gonna use tie wire at least drill 2 small holes below the mc and dont wrap the tie wire around the stud...

they dont want it around the stud because it pulls the stud in.....

 

[tonyou812]

Its mixed here too. generally I use jimmy straps and never have a problem. A lot of inspectors get a "Bee in their bonnet" when it comes to tie waps and MC.

 

[tonyou812]

this logic probably won't help since it may be a case of "my mind is made up, don't confuse me with facts" but since 330.30(D) allows it to be unsupported when fished, next month, after the rock is on, you could fish it thorough the same cavity without support. Kinda makes the type of support used now seem a little insignificant.

I guess when you fish it in it has a less chance to get "pinched"

 

[ultramegabob]

Im having a hard time pictureing what the method of tie wiring m.c. cables for support is. I have always used jiffy clips along the framework, and batwings on wires above suspended ceilings.