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Modern Electrical Installation for Craft Students, 3rd Edition
book

Modern Electrical Installation for Craft Students, 3rd Edition

by Brian Scaddan
November 2013
Intermediate to advanced content levelIntermediate to advanced
182 pages
6h 6m
English
Newnes
Content preview from Modern Electrical Installation for Craft Students, 3rd Edition
Electrical industries 107
7
N
Hence current carrying capacity of cable, /
z
=
correction factors
30
0.94 x 0.725
= 44 A
.
cable size (from tables) = 6.0 mm
2
7.3 x 29.17 x 15
and volt drop = = 3.2 V (acceptable)
F
1000
(b) as (a) then:
Correction factors:
Ambient temperature only 0.87
Thermal insulation 0.75
/
N
30
.
/
z
=^ = = 34.4 A
0.87 0.87
.
cable size (from tables) = 4.0 mm
2
11 x 2.17 x 15
and volt drop = = 4.8 V (acceptable)
1000
v F
'
These calculations establish that in each case a twin cable can be
selected for its current carrying capacity and voltage drop. However, such
twin cables have a smaller C.P.C. than the phase conducto ...
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Publisher Resources

ISBN: 9781483106205