January 2016
Intermediate to advanced
110 pages
3h 30m
English
Content preview from The IEE Wiring Regulations Explained and Illustrated, 2nd Edition
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Circuit design
From Table 54C of the Regulations, /c= 115. Now
S=y/tft)/k
Therefore for
each
type of protection
we
have
the
following
sizes
s:
BS88 0.9 mm
2
BS 1361 1.7 mm
2
MCBtypel 0.57 mm
2
MCB type 2 0.75 mm
2
Hence our
4
mm
2
CPC is of adequate size.
Protection
It simply remains to decide on the type of
protection.
Probably a
type 2 MCB is the most economical. However, if
this
is chosen a
check should be made on the shower circuit to ensure that this
type of protection is also suitable.
Design problem
In a factory it is required to install, side by side, two three-phase
415
V
direct on line motors, each rated at
19
A full load current.
Ther ...
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