Strain Relief; Push-Back Relief; Overload Test On Switches - Century UL 1086 Manual

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40.2 Strain relief

40.2.1 The strain-relief means for a flexible cord shall withstand for 1 minute without displacement a direct
pull of 35 pounds (156 N) applied to the cord, with the connections within the appliance disconnected.
40.2.2 A 35-pound (16-kilogram) weight is to be suspended from the cord and supported by the appliance
so that the strain-relief means will be stressed from any angle that the construction of the appliance
permits. The strain relief is not acceptable if, at the point of disconnection of the conductors, there is such
movement of the cord as to indicate that stress would have resulted on the connections.

40.3 Push-back relief

40.3.1 To determine compliance with 11.1.1.12, a product shall be tested in accordance with 40.3.2
without occurrence of any of the conditions specified in 11.1.1.12 (a) – (d).
40.3.2 The supply cord is to be held 1 inch (25.4 mm) from the point where the cord emerges from the
product and is then to be pushed back into the product. The cord is to be pushed back into the product
in 1-inch (25.4-mm) increments until the cord buckles or the force to push the cord into the product
exceeds 6 lbf (26.7 N). The supply cord within the product is to be manipulated to determine compliance
with 11.1.1.12.

41 Overload Test on Switches

41.1 A switch or other device that controls a motor and has not been investigated and found to be
acceptable for the purpose, shall perform acceptably when subjected to an overload test consisting of 50
cycles of operation, making and breaking the locked-rotor current of the motor. There shall be no electrical
or mechanical breakdown of the device or undue pitting or burning of the contacts as a result of the
overload test and the fuse in the grounding connection shall not open.
Exception: A switch or other device interlocked so that it will not have to break the locked-rotor current
of the motor.
41.2 To determine whether a switch or other control device complies with the requirement in 41.1, the
appliance is to be connected to a grounded supply circuit of rated frequency and voltage in accordance
with 32.1, with the rotor of the motor locked in position. During the test, exposed dead metal parts of the
appliance are to be connected to ground through a 3-ampere plug fuse and the connection is to be such
that any single-pole, current-rupturing device is in an ungrounded conductor of the supply circuit. The
device is to be operated at a rate of not more than 10 cycles per minute, except that a faster rate of
operation may be employed with the concurrence of those concerned.
41.3 A switch or other device that controls a solenoid, a relay coil, or the like and has not been
investigated and found to be acceptable for the purpose shall perform acceptably when subjected to an
overload test consisting of 50 operations as described in 41.4. There shall be no electrical or mechanical
breakdown of the device or undue burning or pitting of the contacts as a result of the overload test and
the fuse in the grounding connection shall not open.
41.4 In a test to determine whether a switch or other control device complies with the requirement in 41.3,
the appliance is to be connected to a supply circuit of rated frequency and 110 percent of maximum rated
voltage. See 32.1. The load on the device under test is to be the same as that which it is intended to
control in normal service. The device is to be operated at a rate of not more than 10 cycles per minute,
except that a faster rate of operation may be employed with the concurrence of those concerned.
HOUSEHOLD TRASH COMPACTORS - UL 1086
40.3.1 added December 17, 1998
40.3.2 added December 17, 1998
DECEMBER 17, 1998