NEC 250.53(D)(2)

NEC 250.118(5)

Flexible metal conduit over 6 feet in length requires an equipment bonding jumper. Even under 6 feet, the FMC connections must provide a reliable ground path, and many jurisdictions require a bonding jumper regardless of length.

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 250.64(C)

Grounding conductor splices must use listed connectors such as split bolts, compression connectors, or exothermic welds. Electrical tape alone is not a listed grounding connection method.

NEC 314.16(B)

Box fill calculations per NEC 314.16 require each #12 conductor to have 2.25 cu in. An overfilled box causes conductor damage, overheating, and difficulty making proper connections.

NEC 314.16(B)(1)-(B)(5)

This box is OVERFILLED, so it is not compliant. Per NEC 314.16(B), each #14 AWG insulated conductor counts as 2.0 cu in (6 conductors = 12.0). Per 314.16(B)(2) all internal clamps together count as one allowance (2.0). Per 314.16(B)(5) all equipment grounding conductors together count as one allowance (2.0). Critically, per NEC 314.16(B)(4) a device yoke counts as TWO volume allowances based on the largest conductor connected to it: 2 x 2.0 = 4.0 cu in — not one. Total = 12.0 + 2.0 + 2.0 + 4.0 = 20.0 cu in required, which exceeds the 18.0 cu in box by 2.0 cu in. A larger box (or fewer conductors) is required.