Installation Directions

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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.

87568939

E 2002 Hoffman Enclosures Inc.Rev. A 103403 P/N 99401517