(1) You must make
sure all electrical circuits that are rated at 600 volts or less have
overcurrent protection.
(2) You
must protect conductors and equipment from overcurrent according to their
ability to safely conduct electrical current.
(3) You must make sure overcurrent devices do
not interrupt the continuity of grounded conductors unless all conductors are
opened at the same time, except for motor running overload protection.
(a) Locate or shield fuses and circuit
breakers so that employees will not be burned or otherwise injured by their
operation.
(b) Make sure handles or
levers of circuit breakers, and similar parts that may move suddenly in such a
way that persons in the vicinity are likely to be injured by being struck by
them, are guarded or isolated.
(4) You must make sure the following fuses
and thermo cutouts have disconnecting means:
(a) All cartridge fuses accessible to
nonqualified persons.
(b) All fuses
in circuits over 150 volts to ground.
(c) All thermal cutouts on circuits over 150
volts to ground.
(5) The
disconnecting means must be installed so you can disconnect the fuses or
thermal cutouts without disrupting service to equipment and circuits unrelated
to those protected by the overcurrent device.
(6) You must provide easy access to
overcurrent devices for each employee or authorized building management
personnel.
(7) You must locate
overcurrent devices:
(a) Away from easily
ignitable material.
(b) Where they
are not exposed to physical damage.
(8) You must make sure circuit breakers
clearly indicate whether they are open (off) or closed (on).
(9) You must install circuit breakers that
operate vertically so the handle is in the "up" position when the breaker is
closed (on).
Circuit breakers used as switches in 120-volt, fluorescent
lighting circuits must be approved for that purpose and marked
"SWD."
