NEC SEC. 501-5 HIGHLIGHTS ON SEALING FITTING REQUIREMENTS
CLASS I, DIV. 1 AND 2
Seals must be placed in each conduit of a device that might produce arcs, sparks, or high temperatures.
Figure 2.
Seals Within Conduit Smaller Than 2 Inches
If the conduit is 2 inches or larger, a seal must be placed within 18 inches of the enclosure.
Figure 3.
Seals Within Conduit Larger Than 2 Inches
SEC. 501-5(A)(1)
PERMITS
EXPLOSIONPROOF
UNIONS AND
ELBOWS BETWEEN
SEAL AND
APPARATUS
ENCLOSURE.
ENCLOSURE
TO BE SEALED
18 MAX
ENCLOSURE
TO BE SEALED
2 OR LARGER
CONDUIT
18 MAX
