Page 289 - Electrical Safety of Low Voltage Systems

Steinmetz, Charles P., 143
Step voltage, 7, 139–140, 139f, 140f
vs. touch voltage, 140–141
Superposition principle, 276–277, 277f
Supplementary bonding conductors (SB), 181, 239
Supply, automatic disconnection of, 19–20
Supply, disconnection of, 2
Swimming pools, electrical safety in, 250–252, 251f, 252f
Synoptictable, 281

T
Temporary overvoltage, 201
Tetanization, 77–78, 78f
Thermal magnetic molded case circuit breaker, 101f
Thermal shock, 79–80, 80f
Thevenin theorem, 260, 277–278, 277f
Time constant, 216, 217t
Time-voltage safety curve, 89, 89f, 98, 99f, 102, 109, 125
TN grounding system, 5, 19, 118f
definition of, 117
ECPs, potential differences between, 122–123, 122f, 123f
ECPs vs. EXCPs, 122–123, 122f, 123f
fault-loop in, 120f, 232–234, 232f, 233f, 234f
ground fault and, 121–122, 121f
local earth connection in, 130–132, 131f, 132f
neutral conductors in, 134–135, 134f
phase-to-protective conductor value, 126–127, 126t
step and touch voltage measurements in, 235–238, 236f, 237f, 238f
supplementary equipotential bonding, 129–130, 130f
temporary overvoltage in, 202–204, 203f, 204f