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Power Station
Substation Substation
Distribution Infrastructure
(Network)
Low Voltage (LV)
distribution
NetworkSubstations
National Grid
High Voltage (HV) Transmission 66kV~400kV
Delta-StarTransformerHV to LV
Referred to as “WORKS” in The Electricity Act 1992 Defined as an(ELECTRICAL INSTALLATION)
in The Electricity Act 1992
Point of entry (POE)
Point of supply (POS)
TransmissionLine MechanicSubstation
MaintainerSubstationMaintainer
SubstationMaintainer
DistributionLine Mechanic
(Underground conductors)
(Overhead conductors)
CONSUMER’SBOUNDARY
Limits of work for Substation Maintainer & Line Mechanic
classes of registration
Electric line(Service Main)
Electric line
230V
400 V
600 V
AC
EndorsedDistribution
Line Mechanic
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