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FC § 2407.4.2
Durable signs that provide the following cautions and information shall be conspicuously posted: 1. Designate the process zone as dangerous with respect to fire and accident.
2.Restrict access to qualified personnel only.
3.Indicate the grounding requirements for all electrically conductive objects in the flammable vapor area, including persons working in that area.
4.Indicates the maximum potential sparking distance as set forth in FC 2407.2.
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