Portable electric equipment must not be used in a hazardous location described in subpart 111.105 of this chapter except:

1. (a) Self-contained, battery-fed, explosion-proof lamps approved by Underwriters Laboratories Inc., Factory Mutual Research Corporation, or other independent laboratory recognized by the Commandant, for use in a Class I, Division 1 location for the electrical group classification of the cargo;
2. (b) Intrinsically safe equipment approved by Underwriters Laboratories Inc., Factory Mutual Research Corporation, or other independent laboratory recognized by the Commandant, for use in a Class I, Division 1 location for the electrical group classification of the cargo; and

3. (c) Any electrical equipment, if:

   1. (1) The hazardous location is:

      1. (i) Enclosed; and
      2. (ii) Gas free;

   2. (2) The adjacent compartments are:

      1. (i) Gas free;
      2. (ii) Inerted;
      3. (iii) Filled with water;
      4. (iv) Filled with Grade E liquid; or
      5. (v) Spaces where flammable gases are not expected to accumulate; and:

   3. (3) Each compartment where flammable gas is expected to accumulate is:

      1. (i) Closed; and
      2. (ii) Secured.

[CGD 74-125A, 47 FR 15230, Apr. 8, 1982]