Cc since protection MCB factor need applied.8 2.3 6.30 1.56
95 0.
The cable rating, given by:
I
I
t
n
Current rating protective device )
The product of
t
the correction factors
the correction factors included this calculation are:
Ca ambient temperature; from the table shown Table 14.10
50 0.8 2.8
16 2.
Table 14.63 0.
Cable rating, 34.25 1.c.
Cg grouping factors need not applied.
Ci thermal insulation demands that assume installed method (see Table 14.93 0.5 15
4 9.3 7.1 the correction factor for
35°C 0.
From column the table shown Table 14.5
6 7.2).4
10 4.75 1.3 Voltage Drop Cables Factor.c.94.46 0.04 A
t
I
32
0 94
.Electrical installations and wiring systems
301
Nominal current setting the protection for this load 32A. Adapted from the IEE site
Guide Kind Permission the Institution Electrical Engineers
Table 4D1B IEE Regulations
Voltage drop (per ampere per metre) Conductor operat-
ing temperature:
70°C
Conductor
cross-sectional
area (mm2
)
Two-core
cable, d.4 4.49 0.5 25
2.65 0.09A and will therefore choose 32A MCB for the nominal current
setting the protective device, In.
(mV/A/m)
Two-core cable,
single-phase a.80 1.4 3.
The design current 26.
(mV/A/m)
Three- four-core
cable, three-phase
(mV/A/m)
1 4
1 38
1.81
70 0.42
.50
35 1.2, 10mm cable, having rating 46A, is
required carry this current.95 0.4
r r
25 1
