×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Liquidtight flexible conduit

Liquidtight flexible conduit

Liquidtight flexible conduit

(OP)
Can anyone tell (per NFPA) what is the maxium run length for liguidtight flexible nnmetallic conduit.

RE: Liquidtight flexible conduit


Here it is as per the Ontario Electrical Safety Code - 2003'

Rule  12-1302(2)

Runs of not more than 1.5 m of 3/8 (12) trade size liquid-tight flexible conduit shall be permitted for the connection of equipment.

Intent for Rule 12-1302(2).  Since the 3/8 trade size conduit is not recognized as a general-purpose conduit raceway method, we intend that it be restricted in use to runs of not more than 1.5 m for the connection of electrical equipment.

RE: Liquidtight flexible conduit

Per NEC, I'm not aware of a maximum length.  However, if an equipment bonding jumper is required and routed on the outside of the flex, the length of the bonding jumper cannot exceed 6 feet.  This situation is typically encountered when a rigid steel conduit system is used as a grounding conductor (the el cheapo) and the flex is used for final connection to a motor.  If you run a separate grounding conductor all the way back, this removes this length restriction, I believe.  

RE: Liquidtight flexible conduit

per 2002 NEC  356.12(3): Uses not permitted, lengths longer than 1.8m (6 ft) except as permitted in 356.100(5) or where longer length is approved as essential for a required degree of flexibility.

RE: Liquidtight flexible conduit

except as permitted in 356.100(5)

That should have been 356.10(5)which refers to support 356.30 : every 900mm (3ft) and within 300mm (12") on every box,fitting,etc.

RE: Liquidtight flexible conduit

Crowbar1 is right - I missed the "nnmetallic" in the original question.  My answer was for metallic flex.

Sorry for the confusion.

Dave

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources