NEC 250.118(5)

NEC 250.102

Flexible metal conduit in this size/length is not a reliable ground path; an equipment bonding jumper or an EGC must be run to bond the motor.

NEC 250.118 / 250.122 / 406.4(C)

Even though UF cable includes a grounding conductor, if individual conductors are run in conduit underground, an equipment grounding conductor of a recognized type must be included and sized with the circuit so the receptacle has an effective ground-fault current path.

NEC 250.118 / 410.44

Suspended ceiling support wires and grid members are not listed as equipment grounding conductors. A separate equipment grounding conductor or grounding path must be provided for all lighting fixtures.

NEC 250.146(D) / high-rise office Electrical Plans

Data rooms require isolated ground (IG) receptacles to prevent electromagnetic interference from the building's general grounding system from affecting sensitive electronic equipment. The high-rise office plans specifically call out IG receptacles for data room locations.

NEC 250.32(B)

This is correct. In a sub-panel (whether in the same building or a separate structure with a 4-wire feeder), the neutral must be isolated from the equipment grounding conductor and the enclosure. Bonding neutral to ground at a sub-panel creates parallel paths for return current, which can put current on metal parts and create shock hazards. The bonding is done only at the main panel (service equipment).

NEC 250.53(D)(2)

A metal underground water pipe electrode must be supplemented by an additional grounding electrode. It cannot serve as the sole grounding electrode because plastic pipe repairs can interrupt the path.