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238
The Kinematograph Year Book. CAPACITY OF CONDUITS.
Maximum capacity of Conduits for the simultaneous drawing in of standard 250-volt. V.I.R. cables.
Size of Conduit
-£ in.
1 in. 1| in. H in.
2 in. I 2$ in.
Size of Cable
Approx.
Conduc
overall
tor
Diameter
1/-044
0150
3/-029
0180
3/-036
0-200
7/-029
0-210
7/-036
0-235
7/-044
0-270
7/-052
0.300
7/064
0-345
19/044
0.380
19/-052
0-425
19/-064
0-500
19/083
0-630
37/072
0-750
MAXIMUM NUMBER OF CABLES
B
B
B
S B
B
10 20 10 20 8 18 6 12 5 10 4 8 3 6 2 4 4 3
S B S
8 6
6 —
5 10
4 8
3 6
— 4
— 2
7 12
6| 9 5 8 3[ 5 2, 3
The columns headed S apply to runs of conduit which have a distance not exceeding 14 ft. between draw-in boxes, and which do not deflect from the straight by an angle of more than 150.
The columns headed B apply to runs of conduit which deflect from the straight by an angle of more than 15°.
Abstracted by courtesy of the Institution of Electrical Engineers.
TABLE OF WIRE FUSES.
Current Rating
Tinned Copper Wire S.W.G.
Standard Alloy Wire S.W.G.
1-8
27
30
38
23
50
35
21
8-5
30
—
100
29
■ —
150
25
—
17
24
—
20
23
■ —
24
22
—
30
21
—
37
19
—
46
18
—
53
18
—
60
17
—
64
17
—
83
15
—
100
14
—
The current ratings given above refer to the normal maximum current of the circuit, and do not refer to the overload at which the cut-out will operate.
The full normal load on a fuse should be two-thirds of its fusing load. For arcs, use copper fuses rated at double normal current to allow for striking. On motor circuits the allowance will depend upon the starting current. Allow 50 to 100 per cent, for D.C. motors or A.C. repulsioninduction motors, four times for wound induction motors, six to eight times for squirrel-cage. On 3-phase motor circuits always fuse heavily.