This guide provides a practical breakdown of pull box sizing rules as per NEC Article 314, focusing on different pull configurations and calculations engineers should consider. In angle pulls, conduits enter and exit from adjacent sides of the pull box. NEC Article 314 establishes requirements for the installation and use of electrical boxes, conduit bodies, fittings, and handhole enclosures. That means the minimum dimensions of boxes and. stallation and use of boxes. The article includes table references that guide the electrician in the selection of the proper box size necessary to safely accommodate ele trical service requirements. The box capacity table shown (page A-5) is reproduced in part from the NEC® as a quick reference and. The question is, can I, according to AS3000 (Australia's wiring rules) have one cable size from the SW/BD to the PIT/JB ( let's say 10mm2) and then different cable size for the two branches (let's say 2. 5mm2 and 6mm2)? A reference to AS 3000 would help if possible. In. Any work inside the service area must be performed by personnel that is approved to work with high voltage electrical installations. The incoming cable, as well as cables connecting the DISTRIBUTION BOX to.