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Data for Technicians.
495
CAPACITY OF CONDUITS.
Maximum capacity of Conduits for the simultaneous drawing in of standard 250-volt. V.I.R. cables.
Size of Conduit
1 in.
l£ in. 1£ in.
2 in. 2* in
Size of Cable
MAXIMUM NUMBER OF CABLES
Conductor
Approx. overall Diameter
B
B
1/-044 3/-029 3/-036 7/-029 7/-036 7/-044 7/-052 7/-064 19/-044 19/-052 19/064 19/-083 37/-072
0150 01 80 0-200 0-210 0-235 0-270 0.300 0-345 0.380 0-425 0-500 0-630 0-750
The columns headed S apply to runs of conduit which have a distnnce 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 150.
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 twothirds 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.