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(A) General
Borders and proscenium sidelights shall be as follows:
  1. Constructed as specified in 520.43
  2. Suitably stayed and supported
  3. Designed so that the flanges of the reflectors or other guards protect the lamps from mechanical damage and from accidental contact with scenery or other combustible material
(B) Connector Strips and Drop Boxes
Connector strips and drop boxes shall be as follows:
  1. Suitably stayed and supported
  2. Listed as stage and studio wiring devices
(C) Cords and Cables for Border Lights, Drop Boxes, and Connector Strips
(1) General
Cords and cables for supply to border lights, drop boxes, and connector strips shall be listed for extra-hard usage. The cords and cables shall be suitably supported. Such cords and cables shall be employed only where flexible conductors are necessary. Ampacity of the conductors shall be as provided in 400.5.
(2) Cords and Cables Not in Contact With Heat-Producing Equipment
Listed multiconductor extra-hard-usage-type cords and cables not in direct contact with equipment containing heat-producing elements shall be permitted to have their ampacity determined by Table 520.44(C)(2). Maximum load current in any conductor with an ampacity determined by Table 520.44(C)(2) shall not exceed the values in Table 520.44(C)(2).
Table 520.44(C)(2) Ampacity of Listed Extra-Hard-Usage Cords and Cables with Temperature Ratings of 75°C (167°F) and 90°C (194°F) [Based on Ambient Temperature of 30°C (86°F)]
Size (AWG) Temperature Rating of Cords and Cables Maximum Rating of Overcurrent Device
75°C (167°F) 90°C (194°F)
14 24 28 15
12 32 35 20
10 41 47 25
8 57 65 35
6 77 87 45
4 101 114 60
2 133 152 80
Note: Ampacity shown is the ampacity for multiconductor cords and cables where only three copper conductors are current-carrying as described in 400.5. If the number of current-carrying conductors in a cord or cable exceeds three and the load diversity is 50 percent or less, the ampacity of each conductor shall be reduced as shown in the following table:
(3) Identification of Conductors in Multiconductor Extra-Hard-Usage Cords and Cables
Neutral conductors shall be white without stripe or shall be identified by a distinctive white marking at their terminations. Equipment grounding conductors shall be green with or without yellow stripe or shall be identified by a distinctive green marking at their terminations.
Table 520.44(C)(3) Ampacity Adjustment Factors for More Than Three Current-Carrying Conductors in a Cord or Cable Where Load Diversity Is 50 Percent or Less
Number of Conductors Percent of Ampacity Value in Table 520.44(C)(3)
4—6 80
7—24 70
25—42 60
43 and above 50
Note: Ultimate insulation temperature. In no case shall conductors be associated together in such a way with respect to the kind of circuit, the wiring method used, or the number of conductors such that the temperature limit of the conductors is exceeded.
A neutral conductor that carries only the unbalanced current from other conductors of the same circuit need not be considered as a current-carrying conductor.
In a 3-wire circuit consisting of two-phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, the neutral conductor carries approximately the same current as the line-to-neutral currents of the other conductors and shall be considered to be a current-carrying conductor.
On a 4-wire, 3-phase wye circuit where the major portion of the load consists of nonlinear loads, there are harmonic currents in the neutral conductor. Therefore, the neutral conductor shall be considered to be a current-carrying conductor.
Informational Note: For the purposes of Table 520.44(C)(3), load diversity is the percentage of the total current of all simultaneously energized circuits fed by the cable to the sum of the ampacity of all circuits in that cable.
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