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Aluminum flex/Steel flex #39094
06/09/04 10:27 AM
06/09/04 10:27 AM
A
aldav53  Offline OP
Member
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
Are there requirements where steel flexible conduit has to be used over Aluminum? Is steel considered ridgid?


The Golden Rule - "The man with the gold makes the rule"
Work Gear for Electricians and the Trades
Re: Aluminum flex/Steel flex #39095
06/09/04 03:59 PM
06/09/04 03:59 PM
H
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
None that I can think of other than maybe environmental.

Both are FMC or Greenfield so no, steel is not rigid.

-Hal

Re: Aluminum flex/Steel flex #39096
06/09/04 04:06 PM
06/09/04 04:06 PM
E
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
Aluminum is lighter and cheaper than steel. Steel is stronger, more abuse resistant. What are the conditions of use at your installation? Unless the engineer specifies steel, 99% of the time, aluminum will be chosen because of the lighter weight (easier installation) and lower cost.

Steel flex is still flexible and not rigid. Rigid is schedule 80 PVC, schedule 40 PVC, heavy wall metal conduit or intermediate metal conduit. Even though Electrical Metallic Tubing (EMT) seems to be rigid, nowhere is it refered to as a rigid conduit.

Earl


Earl
Re: Aluminum flex/Steel flex #39097
06/09/04 04:24 PM
06/09/04 04:24 PM
Radar  Offline
Member
Joined: Apr 2004
Posts: 349
Los Angeles, CA
Pay attention to job specifications, if there are any. In many specs, especially public works, steel flex is specified, and therefore aluminum flex would not comply. Remember, engineers do not have to install the stuff.

One other issue, there are cities in and around the Los Angeles area where approved types of aluminum flex conduit can be utilized as the grounding path, even when the length exceeds 6'. I believe it's 100' for 1/2" Al-Flex, less for 3/4", and less again for 1".

There are problems with the interpretation of this ruling, and it does not apply in all cities. Without saying this is a good or bad idea, many local contractors take advantage of the savings by not providing ground wires when installing Al-Flex.

Radar


There are 10 types of people. Those who know binary, and those who don't.
Re: Aluminum flex/Steel flex #39098
06/09/04 04:35 PM
06/09/04 04:35 PM
B
BPHgravity  Offline
Member
Joined: Apr 2003
Posts: 139
Port Charlotte, Florida
Another consideration is that AL is not magnetic and you will not have issues such as Hyteresis.


Bryan P. Holland, ECO.
Secretary - IAEI Florida Chapter
Re: Aluminum flex/Steel flex #39099
06/09/04 06:47 PM
06/09/04 06:47 PM
E
Electric Eagle  Offline
Member
Joined: Apr 2002
Posts: 914
Alpharetta, GA
But the Aluminum stuff will turn your hands black and everything you touch. For that reason I prefer the steel.

Re: Aluminum flex/Steel flex #39100
06/09/04 06:56 PM
06/09/04 06:56 PM
R
Ralpha494  Offline
Member
Joined: May 2004
Posts: 73
Pewaukee,WI,USA
You also can't use some of the set screw connectors, probably cuz they punch a hole in it

Re: Aluminum flex/Steel flex #39101
06/09/04 06:58 PM
06/09/04 06:58 PM
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
Bergen Co.,N.J. USA
... Also, with aluminum,you have to use an "MC" type connector,where the binding screw won't pierce the jacket,..with steel, you can use the standard "Bx" connector..
Russ


.."if it ain't fixed,don't break it...call a Licensed Electrician"
Re: Aluminum flex/Steel flex #39102
06/09/04 07:00 PM
06/09/04 07:00 PM
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
Bergen Co.,N.J. USA
... Ralph, you beat me to the punch line!!,.. [Linked Image] [Linked Image] [Linked Image] [Linked Image] I type way too slow..


.."if it ain't fixed,don't break it...call a Licensed Electrician"
Re: Aluminum flex/Steel flex #39103
06/10/04 08:19 AM
06/10/04 08:19 AM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,264
Fullerton, CA USA
Radar,
Is the Aluminum flex still OK as a grounding path in LA??
Somewhere I've got a "square cutter", a tool that was used to hold flex so it could be cut with a hacksaw. It seems like that was a requirement for using the flex as a ground.
I haven't used it in about 20 years.

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