Conduit Pipe :
Pipe are of two types 1) PVC and 2) Metal.
In metal are have more two types :
* G.I galvanized iron
* Steel
Conduit in square inches, of Conductor inside a section of Conduit.
Generally, we use Conduit because of cost of the steel is high.
Standard diameter of Conduit size type :
1) 1/2 inch pipe (13mm)
2) 1/3 inch pipe (19 or 20mm)
3) 1 inch (25mm)
4) 1-1/2 (32mm)
Their are three types og guage classified in requirement of Conduit
1) light guage - 0.8 mm to 1.2mm
2) Medium guage - 1.5 mm to 1.8 mm
3) Heavy guage - 2mm to 2.5mm
According to Indian Standard must be left with 40% space.
Accessories for Conduit :-
Bent, elbo(45° or 90° ) Junction box, Glue, tape.
Cable spacing factor :
To determine the Conduit size needed, multiply the quality of each size of cable by the appropriate factor compare the total with Conduit show in example.
Example :
* What size of Conduit is required for 6 number 4sqmm cables in three metres run with no bands
Solution :
6 × 58 = 358 so the nearest size of the Conduit with a factor greater than 348 is 20mm.
Conduit factor :
Conduit diameter (mm) capacity factor
16 290
20 460
25 800
32 1400
Cable factor 1 :
Single core PVC insulated cables
In straight runs of Conduit not exceeding 3M length.
Type of Conductor Conductor cross factor sectional area
(sqmm)
Solid 1.0 22
1.5 27
2.5 39
Stranded 1.5 31
2.5 43
4.0 58
6.0 88
10.0 146
Cable factor 2 :
Single core PVC insulated cables
In straight runs of Conduit exceeding 3M length or In runs of any length incorporate bends or sets.
Type of Conductor Conductor cross factor sectional area
(sqmm)
Solid
(or) 1.0 16
Stranded 1.5 20
2.5 30
4.0 43
6.0 58
10.0 105
Figure :
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