BS 31:1940

Co-operating organisations
Foreword
Specification
Nomenclature
1 Conduit, fittings, etc.
Manufacture
2 Material and method of manufacture
3 Screw threads
4 Outside diameter of conduit
5 Length of conduit
6 Length of thread
7 Thickness of conduit
8 Thickness of fittings
9 Length of recessed portion in plain fittings
10 Thread in screwed fittings
11 Plain couplers
12 Screwed couplers
13 Running couplers
14 Elbows
15 Normal bends
16 Half-normal bends
17 Tees
18 Split fittings
19 Small circular boxes
20 Large circular boxes
21 Oblong boxes
22 Covers for boxes
23 Inspection fittings
24 Covers for fittings other than boxes
25 Ordinary clips
26 Girder clips
27 Single and multiple saddles
28 Spacing plates
29 Pipe hooks
30 Screwed reducers
31 Iron plugs
32 Lock-nuts
33 Entry bushes
34 Tolerance on dimensions
Tests
35 General
36 Test pieces for steel
37 Test of malleable cast iron
38 Tests for resistance to corrosion
40 Continuity test for non-screwed conduit and
      fittings
41 Tests for dimensions
42 Additional tests for dimensions
Tables
1 Standard dimensions and weight of steel conduit
2 Fittings
3 Tees, elbows, normal and half-normal bends, Figs.
      1 to 4
4 Small (Class B1) and large circular boxes
      (including outlet dimensions for oblong boxes),
      Fig. 5
5 Dome covers, Fig. 8
6 Clips, Figs. 10 and 11
7 Saddles, Figs. 12 and 13
8 Pipe hooks, screwed reducers and iron plugs, Figs.
      14, 15 and 16
9 Entry bushes, Fig. 17
10-15 Gauges
Appendices
A Gauging:
         1 Outside diameter of conduit
         2 Inspection gauges for screw threads
         3 Workshop gauges
B Approximate metric equivalents
C Pipe hooks