Installation Directions

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2014-07-29

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INSTRUCTIONS FOR CONNECTION
OF CONDUIT TO HOFFMAN
BULLETIN A9 ENCLOSURES FOR
CLASS II GROUP E, F, AND G
LOCATIONS

Hoffman Enclosures Inc.
2100 Hoffman Way
Anoka, MN 55303–1745
(763) 422–2211 Tel
www.hoffmanonline.com

1. Conduit entrance must be made either in the upper or the lower end of
the enclosure. The ends are .375 inch steel plate which will provide in
excess of 3 1/2 full threads for conduit size through 2 inch when drilled and
tapped.
2. Drill and tap the hole(s) for conduit entrance at the desired location in the
upper or lower ends. See the table below for the correct drill size. Use
taper pipe thread (NPT) taps only.
Normal Conduit Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pipe Tap Drill Size
1/2–14 (minimum conduit size) . . . . . . . . . . . . . . . . . . . . . . . . . 23/32
3/4–14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15/16
1–11 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5/32
1 1/4–11 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1/2
1 1/2–11 1/2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 23/32
2–11 1/2 (maximum conduit size) . . . . . . . . . . . . . . . . . . . . . . . 2 3/16
3. Screw the conduit into the tapped hole. The conduit must protrude far
enough through the wall to attach a conduit bushing.
4. Attach a conduit bushing to the protruding portion of conduit.
Note: Unused conduit openings must be filled with conduit plugs of the
correct thread size and with a minimum thread engagement of 3 1/2.

Rev. A 103403

E 2002 Hoffman Enclosures Inc.

P/N 99401517

87568939
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