14. 14.
FUSED SPURS
The total number fused spurs unlimited. The
requirements for fused spurs are also given Appendix but the various
circuit arrangements may expressed the block diagrams Fig.Basic Electrical Installation Work
292
SPURS RING CIRCUITS
A spur defined Part the Regulations branch cable from ring
final circuit. 14.
To ring main
To ring main
To ring main
To ring main
Permanently
connected
equipment
Permanently
connected
equipment
Fuse connecting unit and separate switch
Fuse connecting unit incorporating switch
Fuse connecting unit (13A max) and locally controlled equipment
Permanently
connected
equipment
Circuit breaker not exceeding 16A
Clock Fan
FIGURE 14.
Non-fused spurs may connected into the ring circuit the terminals of
socket outlets joint boxes the origin the circuit.
.14
Connection non-fused spurs. fused spur connected to
the circuit through fused connection unit, the rating which should be
suitable for the conductor forming the spur but should not exceed 13A.
A non-fused spur may only feed one single one twin socket outlet.16 shows socket outlets con-
nected the ring, three non-fused spur connections and two fused spur
connections.
Part of
ring circuit
Part of
ring circuit
Part of
ring circuit
30mA RCD
FIGURE 14.14.15
Connection fused spurs.15. The cable used for non-fused spurs must not less than
that the ring circuit.
The general arrangement shown Fig.
NON-FUSED SPURS
The total number non-fused spurs must not exceed the total number
of socket outlets and pieces stationary equipment connected directly
in the circuit. The requirements concerning spurs are given in
Appendix the IEE Regulations but the various circuit arrangements
may expressed the block diagrams Fig
