Guide to the Wiring Regulations
TN-C-S (PME) Combined N/E in supply, separate in installation PME Variant: Multiple earths in supply (Protective Multiple Earthing)
L1
L
L2 L3
Equipment N
N
E
Supply Cables
Supply
Consumer Terminals
Installation
Figure E 2.5  TN-C-S system earthing with PME.
TN-C-S (PNB) PNB Variant Single point of N/E Bonding Protective Neutral Bonding e.g. at switchpanel L1
L
L2 L3
Equipment N E
N
Installation Figure E 2.6  TN-C-S system earthing with PNB.
E
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