Delta CT2000 Series User Manual page 623

Chapter 19 EMC Standard Installation GuideCT2000 Series
TN-C system
TN-C: PE and N are two separate conductors in an electrical installation similar to a three-phase 5wire system, but
near the power side, PE and N are combined into a PEN conductor similar to a three-phase 4 wire system.
TN-C-S system
TN-C-S: A combined earth and neutral system (PEN conductor) is used in certain systems but eventually split up
into two separate conductors PE and N. A typical application of combined PEN conductor is from the substation to
the building but within the building PEN is separated into the PE and N conductors. Direct connection of PE and N
conductors to many earthing points at different locations in the field will reduce the risk of broken neutrals.
Therefore this application is also known as protective multiple earthing (PME) in the UK or as multiple earthed
neutral (MEN )in Australia
Generator or
transformer
Earth Consumer
Generator or
transformer
Earth Consumer
19-10
L1
L2
L3
PEN
L1
L2
L3
N
PE