Wiring Methods

1 Shop Practice with Electrical Code: Wiring Methods

Chapter 3 Wiring Methods and Article 3.0 Wiring Methods Materials 3.0.1.3 Conductors 2

(b) conductors of the same circuit (p.306) All conductors of the same circuit and, where used , the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter, cable tray, cable bus assembly, trench cable or cord unless otherwise permitted.

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3.0.1.3 (b) Conductors of the Same Circuit

3.0.1.3 (b)(1) Paralleled Installations Conductors shall be permitted to be run in parallel in accordance with the provision of 3.10.1.4

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3.0.1.3 (C) Conductors of Different Systems (p.307)

3.0.1.3 (c)(1) 600 Volts, Nominal, or Less.

Conductors of circuits rated 600 volts nominal or less, ac circuits, and dc circuits, shall be permitted to occupy same equipment wiring enclosure, cable or raceway. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway.

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3.0.1.10 Electrical Continuity of Metal Raceways and Enclosure (p.317) metal raceways, cable,

All boxes, fittings, cabinets, and enclosures for conductors must be metallically joined together (bonded) to form a continuous low-impedance fault-current path that is capable of carrying any fault current likely to be imposed on it.

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3.0.1.12 Mechanical Continuity- Raceways and Cables (p.319)

Metal or nonmetallic raceways, cable armors, and cable sheaths shall be continuous between cabinets, boxes, fittings, or other enclosures or outlets.

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3.0.1.13 Mechanical and Electrical ContinuityConductors (p.319) 3.0.1.13(a)

General.

Conductors in raceways shall be continuous between outlets, boxes, devices, and so forth. There shall be no splice or tap within a raceways unless permitted by 3.0.1.15; 3.68.2.47(a); 3.76.2.47; 3.78.2.47; 3.84.2.47; 3.86.2.47; 3.88.2.47; or 3.90.1.6

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3.0.1.14 Length of Free Conductors at Outlets, Junctions, and Switch At least 150 mm of free Points (p.319)

conductor, measued from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction box, and switch point for splices or ther connection of luminaires (fixtures) or devices. Where the opening to an outlet, junction, or switch point is less than 200 mm in any dimension, each conductor shall be long enough to extend at least 75 mm outside the opening

3.0.1.15 Boxes, Conduit 9 Bodies, or Fittings – Where Required (p.320) A box must be installed at each

splice or termination point, except as permitted for: •Cabinet or Cutout Boxes, 3.12.8 • Conduit Bodies, 3.14.16(C) • Luminaires, 4.10.31 •Surface Raceways, 3.86.56 and 3.88.56 • Wireways, 3.76.56

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3.0.1.15 Boxes, Conduit Bodies, or Fittings – Where Required (p.320)3.0.1.15(i) Enclosure

A box or conduit body isn’t required where a splice is made in a cabinet or in cutout boxes containing switches or overcurrent protection devices if the splices or taps do not fill the wiring space at any cross section to more than 75 percent, and the wiring at any cross section doesn’t exceed 40 percent. See 3.12.1.8

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3.0.1.20 Induced Currents in Metal Enclosure or Metal Raceway (p.324) 3.0.1.20 (A) Conductors

Grouped Together. To minimize induction heating of ferrous metallic raceways and enclosures, and to maintain an effective ground-fault current path, all conductors of a circuit must be installed in the same raceway, cable, trench, cord, or cable tray.