)
)
Single-Phase
High Voltage Line
Utility Transformer
Pole or Pad-Mounted
Note Transformer is Center-Tapped so there
is 240V between Phases A-B, but only 120V
from A-N or B-N. Therefore service is described
as 120/240V single phase 3-wire.
Phase A
Conductor
Phase B
Conductor
Neutral (Grounded)
Conductor
120V
120V
240V
Utility Meter
Two Pole Main Circuit Breaker or Fused Switch.
AMP Rating of Circuit Breaker or Fuse is ‘Service Size’.
Green or Bare Ground wire to Water Pipe or
Ground Rod
Electrical Panel
Black
Black or Red
White or Bare
Receptacle
Existing Power Lines
RDU
Neutral Bus
MTU
Fig A-1
Typical Residential Service
120/240V 1
3W
CT
CT
© 2008 Energy, Inc. www.theenergydetective.com
Page 28
A P P E N D I X A
D E T A I L E D I N S T A L L A T I O N I N S T R U C T I O N S
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