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Signs and outline lighting system equipment for wet location use, other than listed watertight type, shall be weatherproof and have drain holes, as necessary, in accordance with the following:
  1. Drain holes shall not be larger than 13 mm (1/2 in.) or smaller than 6 mm (1/4 in.).
  2. Every low point or isolated section of the equipment shall have at least one drain hole.
  3. Drain holes shall be positioned such that there will be no external obstructions.

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