Page 131 - Electrical Safety of Low Voltage Systems
P. 131
114 Chapter Six
FIGURE 6.22 Supplementary equipotential bonding (SB) in area at increased
risk.
Fig. 6.23, upon failure of an ECP, any other earthed metal parts (i.e.,
ECPs and EXCPs) simultaneously attain the same value of fault po-
tential, even if healthy.
This “signature” feature of the TT systems prevents the appear-
ance of dangerous potential differences among grounded metal parts.
FIGURE 6.23 In TT systems, all the ECPs and EXCPs attain the same
potential upon ground faults.
