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EPM 5300 SERIES ADVANCED POWER METERS – INSTRUCTION MANUAL 1–1
EPM 5300 Series Meters
Chapter 1: AC Power
Measurement
GE Consumer & Industrial
Multilin
AC Power Measurement
The economics of electric power distribution networking dictate several configurations of
AC power transmission. The number of phases and voltage levels characterize these
configurations.
1.1 Single Phase System
A single phase system is a basic two-wire system used in low power distribution
applications, such as residential communities or offices. Typically, the voltage is 120V AC.
For higher power requirements, such as small commercial facilities, the typical power
configuration is two lines of 120V AC opposite in phase (see Figure 1.1 B, below).
This system produces 120 volts from line to neutral for lighting and small appliance use.
The line-to-line voltage is 240V AC, used for higher loads such as water heaters, electric
dryers, ranges and machinery.
FIGURE 1–1: Single Phase System: (A) Two-Wire, (B) Three-Wire
Line
Neutral
Line 2
Line 1
Neutral
A)
Single Phase
2 W ires
B)
Single Phase
3 W ires