Cranes and hoists. This paragraph applies to the installation of electric equipment and wiring used in
connection with cranes, monorail hoists, hoists, and all runways.
Disconnecting means -
Runway conductor disconnecting means. A readily accessible disconnecting means shall be provided
between the runway contact conductors and the power supply.
Disconnecting means for cranes and monorail hoists. A disconnecting means, capable of being
locked in the open position, shall be provided in the leads from the runway contact conductors or other power supply on any crane or monorail
If this additional disconnecting means is not readily accessible from the crane or monorail
hoist operating station, means shall be provided at the operating station to open the power circuit to all motors of the crane or monorail
The additional disconnect may be omitted if a monorail hoist or hand-propelled crane bridge
installation meets all of the following:
The unit is floor controlled;
The unit is within view of the power supply disconnecting means; and
No fixed work platform has been provided for servicing the unit.
Control. A limit switch or other device shall be provided to prevent the load block from passing the
safe upper limit of travel of any hoisting mechanism.
Clearance. The dimension of the working space in the direction of access to live parts which may
require examination, adjustment, servicing, or maintenance while alive shall be a minimum of 2 feet 6 inches (762 mm). Where controls are enclosed in
cabinets, the door(s) shall open at least 90 degrees or be removable, or the installation shall provide equivalent access.
Grounding. All exposed metal parts of cranes, monorail hoists, hoists and accessories including
pendant controls shall be metallically joined together into a continuous electrical conductor so that the entire crane or hoist will be grounded in
accordance with 1926.404(f). Moving parts, other than removable accessories or attachments, having metal-to-metal bearing surfaces shall be considered
to be electrically connected to each other through the bearing surfaces for grounding purposes. The trolley frame and bridge frame shall be considered
as electrically grounded through the bridge and trolley wheels and its respective tracks unless conditions such as paint or other insulating materials
prevent reliable metal-to-metal contact. In this case a separate bonding conductor shall be provided.
Elevators, escalators, and moving walks -
Disconnecting means. Elevators, escalators, and moving walks shall have a single means for
disconnecting all ungrounded main power supply conductors for each unit.
Control panels. If control panels are not located in the same space as the drive machine, they shall
be located in cabinets with doors or panels capable of being locked closed.
Electric welders-disconnecting means -
Motor-generator, AC transformer, and DC rectifier arc welders. A disconnecting means shall be
provided in the supply circuit for each motor-generator arc welder, and for each AC transformer and DC rectifier arc welder which is not equipped with
a disconnect mounted as an integral part of the welder.
Resistance welders. A switch or circuit breaker shall be provided by which each resistance welder
and its control equipment can be isolated from the supply circuit. The ampere rating of this disconnecting means shall not be less than the supply
X-Ray equipment -
Disconnecting means -
General. A disconnecting means shall be provided in the supply circuit. The disconnecting means
shall be operable from a location readily accessible from the X-ray control. For equipment connected to a 120-volt branch circuit of 30 amperes or
less, a grounding-type attachment plug cap and receptacle of proper rating may serve as a disconnecting means.
More than one piece of equipment. If more than one piece of equipment is operated from the same
high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a high-voltage switch or equivalent disconnecting means.
This disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts.
Control-Radiographic and fluoroscopic types. Radiographic and fluoroscopic-type equipment shall be
effectively enclosed or shall have interlocks that deenergize the equipment automatically to prevent ready access to live current-carrying