Index A
F
Alarms, see under Security Approved test lamps, 55
Fault finding, 85 Fault protection, 103 Fire alarm system, 36, 92 Functional testing, 79
B Basic protection, 103 Block diagrams, 5 BS EN 60617 symbols, 1–4
C Cable fault location, 89 Call systems, 40, 92 Care of instruments, 56 Central heating systems, 46, 93 Circuit convention, 9 Circuit diagrams, 6 Closed-circuit system, 37 Continuity: of protective conductors, 57 of ring circuit conductors, 61
I Insulation resistance, 66 Interconnection diagram, 5 Ladder logic, 17–20
M Maintained system, 32 Motor starter circuits, 42, 94 Murray loop test, 89
N Non-maintained system, 32 Normally closed and open contacts, 9
O Open-circuit system, 36 Overload current, 86
D Diagrams, 1 Direct-on-line starter, 42 Distribution systems, 26, 28–29
P Polarity, 69 Programmable logic controllers, 17 Prospective short circuit current, 74
E
R
Earth, 104 Earth electrode resistance, 74 Earth fault loop impedance, 70 Emergency lighting, 32, 91 Extra low-voltage lighting, 49
Radial systems, 24 Residual current devices, 80 RCD testing, 79 Relay logic, 15 Ring final circuits, 26
119
