direction or moving to a higher elevation may also improve communication.
INTRINSICALLY SAFE USAGE
Selected portable radios with appropriate factory in- stalled F4 Options are certified as Intrinsically Safe by the Factory Mutual Research Corporation. Intrinsically Safe approval includes Class l, II, Ill, Division 1 hazard- ous locations in the presence of Groups C, D, E, F and G atmospheres.
Hazardous locations are defined in the National Elec- trical Code. Useful standards NFPA 437A and NFPA 437M for the classifications of hazardous areas can be ordered from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
BATTERY PACKS
Only battery packs identified with a green latch shall be used with a portable radio that is rated and labeled as Factory Mutual Intrinsically Safe. Use of
PKPA5X | Rechargeable Battery Pack, Extra High |
| Capacity (Tall Case) |
PKPA5W | Rechargeable Battery Pack, High Ca- |
| pacity (Short Case) |
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