UL-583:2012 pdf free download – STANDARD FOR SAFETY Electric-Battery-Powered Industrial Trucks.
20 Separation of Circuits
20.1 A LVLE circuit shall be separated from all other circuits either by:
a) Locating the circuit in a separate enclosure,
b) Providing through-air and over-surface spacings as specified in Table 18.1, or 18.1.5 or
c) The use of barriers — see 19.5.
20.2 An insulated conductor of internal wiring of a LVLE circuit shall be either:
a) Separated by barriers or segregated from live parts connected to different circuits, or
b) Provided with insulation acceptable for the highest voltage involved.
20.3 Segregation of insulated conductors is to be accomplished by clamping, routing, or equivalent
means that provides permanent separation from live parts of a different circuit.
20.4 A live part in a LVLE circuit shall be constructed so that the possibility of the live part touching dead
metal or touching live parts of other circuits is minimized.
20.5 The barriers mentioned in 20.1 are permitted to be grounded metal not less than 0.020 inch (0.51
mm) thick, or insulating material not less than 0.028 inch (0.71 mm) thick.
PERFORMANCE
21 Abnormal Operation
21 .1 As a test of the ability of a truck to withstand abuse, the truck is to be tested as described in 21.2 and 21.3. There shall be no indication of damage to any parts of the truck that causes a risk of fire, electric shock, or explosion as a result of this test. A thermostat or an overcurrent-protective device that causes interruption of power to the traction or pump motor shall not operate during the first 5 cycles of the test described in 21 .2. If such interruption does occur during the remainder of the test, a thermostat is to be permitted to reclose and an overcurrent-protective device is to be replaced or reclosed. The test is then to be continued until all of the prescribed operations have been concluded.
Exception: When the truck has a cut-back function (activated by temperature, current, etc.) which reduces the truck’s performance, but allows it to continue operation, and this happens after the first five cycles, the test shall continue at the reduced performance level.
21 .2 A load equal to 110 percent of the rated capacity is to be placed on the load carrier at the load center distance specified by the manufacturer. A lift heightlload combination is to be selected that will yield the most work (actual capacity x lift height). For the purposes of the abnormal test, the 110 percent rated load is to be lifted to the lift height that was selected to yield the most work. The truck is to be quickly and rapidly operated through 25 reversals of direction of travel, reversals of lifting, and other operations that are performed by the truck such as flashing of lamps, blowing of horn, and other normal operating sequences.
Exception No. 1: The test may be conducted without reversal of direction. Exception No. 2: Tow tractors are not covered by this requirement.
21.3 The test course for a fork-lift and a platform-lift truck is to be 40 feet (12.2 m) long. At the end of this course, the load is to be raised to the height designated by 19.2 and lowered to the hauling position. The truck with the load is then to be returned to the starting point by reversing the direction of travel.
Exception: The test may be conducted without reversal of direction.
21 .4 If a lift truck has multiple load ratings and corresponding maximum — lift heights, the test described in 22.2.1 is to be conducted for the rated load condition that will produce maximum work (in . lbf).
21 .5 A truck that is designed to utilize different types of power sources shall be tested independently.