Interlocks And Controls; Controls; Interlocks - Century UL 1086 Manual

FEBRUARY 1, 1996 HOUSEHOLD TRASH COMPACTORS - UL 1086 33
27.5 The requirement in 27.4 applies to those portions of a part adjacent to moving parts considered to
be a risk of injury to persons.
27.6 A part as mentioned in 27.4 or portion of a part as specified in 27.5 shall withstand the applicable
impact test described in 27.7 without being affected to the extent that a moving part that may cause injury
to persons is exposed.
Exception: A part that complies with the requirements in 6.4.
27.7 A smooth steel sphere 2 inches (50.8 mm) in diameter and weighing approximately 1.18 pounds
(535 grams) is to be allowed to fall vertically from rest through a distance of 51 inches (1.30 m) to strike
the part under test. For a part not able to be struck from above by a free-falling sphere, the sphere is to
be suspended by a cord and allowed to fall as a pendulum through a vertical distance of 51 inches.
27.8 Following the impact test described in 27.7, the probe illustrated in Figure 7.1 is to be used to
determine whether a moving part that may cause injury to persons is exposed so as to present such a
risk.

28 Interlocks and Controls

28.1 Controls

28.1.1 A compactor shall be equipped with a key-lock switch having a removable key or the equivalent to
prevent unauthorized use.
28.1.2 The drive mechanism shall be capable of being stopped by the key lock, or a stop-start switch.
28.1.3 Once stopped, the ram shall retract upon restarting if it has traveled more than 1 inch (25.4 mm)
from the fully retracted position or if the door cannot be opened.
28.1.4 If the ram can be operated by an override switch after an interlock has stopped the ram, upon
restarting, the ram shall retract if it has traveled more than 1 inch (25.4 mm) from the fully retracted
position.

28.2 Interlocks

28.2.1 An interlock is a device or arrangement by which the function of one part is controlled by the
functioning of another.
28.2.2 The actuator of an interlock switch shall be located or protected so that it cannot be easily
defeated.
28.2.3 An interlock is considered to comply with the requirement in 28.2.2 if it cannot be defeated by use
of the probe illustrated in Figure 7.1 or if another acceptable arrangement of the interlock or system of
interlocks is provided.
28.2.4 An interlock shall not be capable of being defeated by material or trash accumulation that could
occur in normal use.