Conduits and Boxes

8.3 CONDUITS AND BOXES

(A/E Note: Refer to VA Specification Section 16742 Infrastructure (Wire

and Cable) Telecommunications Equipment and Systems for additional

information)

8.3.1 GENERAL

(a) All conduit runs shall contain no more than two 45-degree (or one

90-degree bend with access before and after bend) bends (no

LB/condulets) between pull and junction boxes, manholes or

telecommunications closets. Contact TCD-194D for technical approval for

all conduit requirements.

(b) Minimum radius of conduit bends shall be as follows:

Table 8-1 Minimum Radius of Conduit Bends

CONDUIT SIZE

CONDUIT BENDS RADIUS

mm (Inches)

20 (3/4) (minimum)

225 (9)

25 (1)

275 (11)

32 (1 )

350 (14)

40 (1 )

425 (17)

50 (2)

525 (21)

65 (2 )

625 (25)

75 (3)

775 (31)

90 (3 )

900 (36)

100 (4)

1125 (45)

(c) All conduit bends shall be made so the internal conduit diameter is

not reduced.

(d) Conduit originating from telecommunications closets and pull boxes

or wireways shall be in accordance with the following criteria:

Table 8-2 Conduit Sizing Criteria

NUMBER OF OUTLETS*

CONDUIT SIZE mm (Inches)

1, 2

20 (3/4)

3, 4

32 (1 )

5 and above

75 (3)

* Install conduit and outlet boxes for telecommunications outlets in

solid or tiled walls, in freestanding counter tops, walls containing

fire stops or insulation and for telecarts and pay telephones.

(e) Install insulated bushings on conduit ends.

ELECTRICAL DESIGN MANUAL

8-3

TELEPHONE/DATA SYSTEMS