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BEFORE INSTALLING, READ ENTIRE INSTRUCTIONS CAREFULLY
FOR UNREINFORCED FLAT SURFACES:
CAST METAL: . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NOT LESS THAN 1/8" (3.2 mm) THICK
MALLEABLE IRON: . . . . . . . . . . . . . . . . . . . . . . . . .NOT LESS THAN 3/32" (2.4 mm) THICK
DIE-CAST METAL: . . . . . . . . . . . . . . . . . . . . . . . . . .NOT LESS THAN 5/64" (2.0 mm) THICK
Metal of lesser thickness but not less than 3/32 inch (2.4mm), 1/16 inch (1.6mm) and 3/64 inch
(1.2mm) respectively, may be acceptable provided that the surface under consideration is: curved,
ribbed, or otherwise reinforced to provide mechanical strength or of a size or shape that provides
mechanical strength equivalent to that required.
Metal of lesser thickness may be acceptable when the following factors are taken into account:
A. MECHANICAL STRENGTH
B. RESISTANCE TO IMPACT
C. MOISTURE-ABSORPTION PROPERTIES
D. COMBUSTIBILITY
E. RESISTANCE TO CORROSION, AND
F. RESISTANCE TO DISTORTION AT TEMPERATURES TO WHICH THE
ENCLOSURE MAY BE SUBJECTED UNDER CONDITIONS OF
NORMAL OR ABNORMAL USE.
FOR A NON-METALLIC ENCLOSURE, ALL OF THESE FACTORS ARE TO BE
SHEET METAL:
In addition to the above factors an enclosure of sheet metal shall be determined with respect to size
and shape, thickness of metal, and acceptability for the application, considering the intended use of the
disposer.
Generally, the use of sheet steel, having a thickness less than 0.0026 inch (0.66mm) if uncoated or
0.029 inch (0.74mm) if galvanized, or of nonferrous sheet metal having a thickness less than 0.036
inch (0.91mm) is not acceptable other than for the relatively small areas or for surfaces that are curved
or otherwise reinforced.
Sheet metal to which a wiring system is to be connected in the field shall have a thickness not less
than 0.032 inches (0.81mm) if uncoated steel, not less than 0.034 inches (0.86mm) if galvanized steel,
and not less than 0.045 inches (1.14mm) if nonferrous.
4240 E. La Palma Avenue, Anaheim, CA 92807 • (800) 454-4423
(PER U.L. 430)
CONSIDERED WITH RESPECT TO THERMAL AGING.
INSTALLATION
INSTRUCTIONS
GUIDELINES FOR
FIELD CONSTRUCTED
ENCLOSURES
560P402P01 REV A
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