95 0.80 1.Electrical installations and wiring systems
301
Nominal current setting the protection for this load 32A.09A and will therefore choose 32A MCB for the nominal current
setting the protective device, In. 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.2, 10mm cable, having rating 46A, is
required carry this current.1 the correction factor for
35°C 0.63 0.46 0.8 2.
Ci thermal insulation demands that assume installed method (see Table 14.94.3 7.
(mV/A/m)
Three- four-core
cable, three-phase
(mV/A/m)
1 4
1 38
1.4
10 4.8
16 2.50
35 1.42
.
(mV/A/m)
Two-core cable,
single-phase a.3 6.
Cc since protection MCB factor need applied.2).93 0.75 1.5
6 7.
Cg grouping factors need not applied.
The design current 26.4 3.30 1.65 0.
Cable rating, 34.81
70 0.c.3 Voltage Drop Cables Factor.5 25
2.c.
Table 14.49 0.5 15
4 9.04 A
t
I
32
0 94
.
From column the table shown Table 14.56
95 0.25 1.4
r r
25 1.10
50 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 14.8 2.4 4
