9
Safety
Minimum Working Clearance
To reduce the risk of injury, all persons require adequate working clearance around the electrical panel or other
electrical equipment. The table below identifies the minimum working clearance needed. Refer to U.S. Occupa-
tional Safety & Health Administration (OSHA) Regulations (Standards - 29 CFR) Safeguards for personnel pro-
tection. -1910.303(g)(1)(i), or any other applicable national, state or local regulations, for additional information.
MINIMUM WORKING CLEARANCE 0-600 VOLTS
WIDTH
OF WORKING
CLEARANCE
AREA
HEIGHT
OF WORKING
CLEARANCE
AREA
MINIMUM WORKING CLEARANCE
IN FRONT OF ELECTRICAL PANEL/EQUIPMENT
EXPOSED LIVE PARTS
ON ONE SIDE OF WORK
SPACE AND NO LIVE
GROUNDED PARTS ON
THE OTHER SIDE.
EXPOSED LIVE PARTS
ON ONE SIDE OF WORK
SPACE AND LIVE
GROUNDED PARTS ON
THE OTHER SIDE.
EXPOSED LIVE PARTS
ON ONE SIDE OF WORK
SPACE AND EXPOSED
LIVE PARTS ON THE
OTHER SIDE.
30 in (760 mm)
MINIMUM OR
WIDTH OF
ENCLOSURE,
WHICH EVER IS
GREATER
78 in (1980 mm)
MINIMUM OR
HEIGHT OF
ENCLOSURE,
WHICH EVER IS
GREATER
36 in (915 mm) MINIMUM
42 in (1065 mm) MINIMUM
48 in (1220 mm) MINIMUM
Concrete, brick or tile walls shall be considered as grounded.
Qualified Person
A Qualified person is one who, by possession of a recognized degree, certificate, or professional standing, or
who by extensive knowledge, training, and experience, has successfully demonstrated his/her ability to solve or
resolve problems related to the subject matter, the work, or the project.
Only qualified persons may work on electric circuit parts or equipment that have not been de-energized.
Refer to U.S. Occupational Safety & Health Administration (OSHA) Regulations Standards - 29 CFR 1926.32(m)
and 1910.333, or applicable national, state or local regulations for additional information.