Electrical Pull Box Requirements

Calculating pull box enclosure sizes.

Electrical pull box requirements.

The sizing requirements for pull boxes junction boxes handhole enclosures and conduit bodies exist to prevent conductor insulation damage. The answer to each question is offered up on a separate slide which follows. Three types of pulling schemes are used. Chapter 3 of the national electrical code nec covers wiring methods and materials.

Provisions for boxes and conduit bodies enclosing conductors 18 awg through 6 awg are in 314 16. In this case simply multiply your largest raceway size by 8 and that will give you the minimum length for your box. Those requirements are in 314 28 and they apply to all conductors 4 awg and larger fig. 1 to illustrate how these requirements prevent conductor insulation damage let s consider two extremes in a straight pull situation.

These boxes are calculated from the sizes and numbers of conductors. Pull boxes handholes overview oldcastle infrastructure s underground pull boxes and handholes are the industry s leading product choice to protect and provide access to electrical cables and transformers and are a preferred alternative to running electrical power cables above the ground and across utility poles. Angle pulls which make a 90 degree angle. Take this weekly quiz to test your knowledge of the 2017 national electrical code nec requirements.

Nec 314 16 wiring methods junction box fill the volume of electrical boxes shall be sufficient for the number of conductors devices and cable clamps contained within the box. And u pulls which turn 180 degrees to re enter the. 314 28 pull and junction boxes. Shop for underground pull boxes in boxes enclosures from rexel usa where contractors and project managers can find the electrical underground pull boxes products they need for their projects.

The national electrical code nec mandates specific sizes for pull boxes determined primarily by the conduit or raceway sizes and pulling scheme. The codes shown are examples only and may not be current or accurate for your application or jurisdiction. The code quiz features three questions that are presented in a true false fill in the blank or multiple choice format. 314 28 pull and junction boxes the national electrical code nec has specific requirements detailing how to calculate the maximum numbers of conductors in boxes outlet device junction pull etc and conduit bodies.