Batteries

DOE-HDBK-1092-2004

3. They shall have both circuit conductors insulated from the frame and all other grounded

surfaces.

in NEC 250.6 and 305.6 (a), EX.

Figure 6-3. The ungrounded frame of a generator is acceptable as a grounding electrode

if the circuit conductors are insulated from the frame and all other grounded surfaces.

6.5

BATTERIES

Storage batteries are considered a live source and appropriate precautions should be taken

when working around them. Information regarding batteries and battery rooms can be found in

NESC, NFPA 70E Article 240 and 320.

6.5.1

SURROUNDING SPACE

Adequate space should be provided around storage batteries for safe inspection, maintenance,

testing, and cell replacement. Space shall be left above cells to allow for operation of lifting

equipment when required, for addition of water, and for taking measurements.

6.5.2

LOCATION

Storage batteries should be located in a protective enclosure or area accessible only to qualified

persons. A protective enclosure can be a battery room; a control building; or a case, cage, or

fence that shall protect the contained equipment and minimize the possibility of inadvertent

contact with energized parts.

6.5.3

VENTILATION

The battery storage area shall be ventilated by either a natural or powered ventilation system to

prevent accumulation of hydrogen. The ventilation system shall limit hydrogen accumulation to

less than an explosive level.

6-12