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Options and Technical Data
*K=Mean effective load factor.
DUTY CLASSIFICATIONS
Operation Time Ratings at K=0.65*
Uniformly Distributed Infrequent
Work Periods Work Periods
Max. ON
Hoist Max. ON Max. No. Time From Max. No.
Duty Time of Cold Start of
Class Typical Areas of Application (min/hr) Starts/hr (min) Starts
H2
Light machine shop fabricating, service and maintenance; loads 7.5
75 15 100
and utilization randomly distributed; rated loads infrequently handled (12.5%)
H3
General machine shop fabricating, assembly, storage, and 15
150 30 200
warehousing; loads and utilization randomly distributed (25%)
High volume handling in steel warehouses, machine shops, fabricating
30
H4 plants and mills, and foundries; manual or automatic cycling operations
(50%)
300 30 300
in heat treating and plating; loads at or near rated load frequently handled
LIFTING MOTOR RATINGS
Short Time Rating
This rating indicates how long the hoist can be operated continuously
at the rated capacity on the cycle below, assuming continued operation
for a short time span.
• Single speed: 60 min
• Dual speed: 30/10 min
Intermittent Rating (Percent ED)
Max. Number of Starts Per Hour
This rating indicates the allowable ratio of motor ON time to motor
OFF time, and starts per hour for a hoist operated continuously
at 63% of rated capacity on the cycle below, assuming continued
operation or repeated starting over a long time span.
NER/ER Lifting Motor Ratings
• Single speed: 60% ED, 360 starts/hr
• Dual speed: 40/20% ED, 120/240 starts/hr
3 sec. stop
3 sec. stop
1 cycle
1m lower
1m lift
Example (single speed): %ED = Motor ON time (t1 + t3
) x 100
T (1 cycle)
(
Where T = 1 cycle (t1 + t2 + t3 + t4) and is not more than 10 minutes.)
stop
stop
T (1 cycle)
lower
t 1
t 2 t 3 t 4
lift
BULLARD
®
AND SHUR-LOC
®
HOOKS
These hooks offer a positive locking latch feature.
Consult Customer Service for full details.