Mike Dolt Enterprises
Mike Dolt Enterprises
User: dennis5150, Location: Lockport, IL
Asked on: Wednesday, March 23, 2011 at 11:36 am EDT
Answered on: Tuesday, May 14, 2024 at 3:09 am EDT
Question: The contractor asked if he could use NEMA 4x enclosures or Form 7 LB's as pull points (pull boxes) and sealed all of the conduit openings with seaing putty (duct seal). No arcing, sparking or heat generating devices, terminations, or splices would be inside, these are simply pull boxes or LB's, and the cables would simply pass through. It would seem that this would comply with 502.10 (4), and 502.15 (1) and FPN, but would appreciate any input. Thanks.
NEC 502.10(4) and 502.15(1)
These sections require that pull boxes comply with Article 314.
NEC 314.16(A)(1) (FPN)
This section permits the use of Form 7 LB's with sealing putty for sealing conduit openings that are not used for pull wires.
NEC 502.15(1) (FPN)FPN No. 1 to (1)
NEMA 4 enclosures are raintight and can be used as pull boxes in wet locations.
Conclusion
Based on the information provided, it is permissible to use both NEMA 4x enclosures and Form 7 LB's as pull points (pull boxes) and seal all of the conduit openings with sealing putty, provided that no arcing, sparking, or heat-generating devices, terminations, or splices are present inside. This would comply with NEC 502.10(4), 502.15(1), and the FPN to 314.16(A)(1). Flag for review