North Carolina Electrical Contractor - Swimming Pool Bonding (SP-SP)

For conductors 4 AWG or larger, a straight pull box length shall not be less than 8 times the trade size of the largest raceway, while for angle or U pulls the distance from each raceway entry to the opposite wall shall not be less than 6 times the trade size of the largest raceway in a row plus the sum of the diameters of the other raceway entries on the same wall.

A GEC run solely to rod/pipe/plate electrode(s) is not required to be larger than 6 AWG copper (4 AWG aluminum) — a cap, whereas a common GEC of the wire type shall not be smaller than 3/0 AWG copper or 250 kcmil aluminum — a minimum.

Metal water piping bonding jumpers are sized from Table 250.102(C)(1) but are not required to be larger than 3/0 copper or 250 kcmil aluminum/copper-clad aluminum, while other metal piping likely to become energized is sized from Table 250.122 using the rating of the circuit likely to energize the piping.

EMT is recognized as a type of equipment grounding conductor under 250.118(4), but 250.121(B) prohibits the structural metal frame from being used as an equipment grounding conductor (it may still serve as a grounding electrode conductor or to interconnect electrodes).

No luminaires shall be installed for operation on supply circuits over 150 volts between conductors, while submersible pumps and other submersible equipment are permitted to operate at 300 volts or less between conductors.

Each yoke or strap containing one or more devices requires a double volume allowance based on the largest conductor connected to a device on that yoke, while one or more internal cable clamps require only a single volume allowance based on the largest conductor present in the box.

Where no electrode exists at the building or structure supplied by a feeder or branch circuit, the electrode(s) required by 250.50 shall be installed with a grounding electrode conductor; where a grounding electrode system exists, an EGC is run with the supply conductors and any installed grounded conductor shall not be connected to the EGC or to the electrode(s) at that structure.

Listed pressure connectors, exothermic welding, and machine screw-type fasteners engaging not less than two threads are permitted, while connection devices or fittings that depend solely on solder shall not be used.

Where multiple grounding connections cause objectionable current and 250.4(A)(5) or (B)(4) are still met, discontinuing one or more but not all of the grounding connections is permitted; removing all grounding connections is not permitted.

Per 314.2, round boxes shall not be used where conduits or connectors requiring locknuts or bushings are connected to the side of the box.

Circuits over 250 volts to ground must ensure continuity of metal raceways and metal-sheathed cables by the service methods of 250.92(B) except (B)(1), bonding to the grounded service conductor, which is specific to service equipment.

Per the NASCLA Summary of Business Legal Structures table, a C corporation allows unlimited shareholders with no personal liability and is taxed at the corporate level with a further tax on dividends (double taxation), while an S corporation is limited to 100 shareholders and uses pass-through taxation.