Table of Contents

Table of Contents

Table of Contents

Basic Mechanical Meter Parts

	Base
	Cover
	Frame
	Potential Coil
	Current Coil
	Disk or Rotor
	Damping Magnet
	Stator
	Register
	Potential Lights
	Detent

Blondel’s Theorem

Nameplate Meter Information

	60 Hz
	Number of Wires
	Voltage Rating
	Test Amp (TA) Rating
	Class
	Kh
	Type
	Form
	Serial Number
	Catalog Number

Self-Contained vs. Instrument-Rated Meters

	Self-Contained Meters
	Instrument-Rated Meters

Voltage Transformers

	Purpose
	Ratio
	Polarity
	Accuracy
	Burden Rating

Current Transformers

	Purpose
	Ratio
	Transformer Factor (TF)
	Rating Factor (RF)
	Type
	Polarity
	Accuracy
	Burden Rating
	Shorting Bars, Self-Shorting Devices, & Test Switches

Color Coded Wiring for Instrument Transformers

	Polarity
	Phase Relationships
	Color Codes
	Factory Pre-Wired Meter Sockets
	Separate Current Circuit Return Paths
	Single Point Grounding

Dial Multipliers

	Self-Contained Meters
	Instrument-Rated Meters
	Universal Mechanical Registers
	Hybrid Meters
	Solid State Meters

Calculating Single Phase Amps

	Purpose
	Rule of Thumb
	Never Add Amps!
	Metering Equipment & Transformer Sizing

Calculating Three Phase Amps

	Purpose
	Rule of Thumb
	Open Delta Transformer Secondary
	Never Add Amps!
	Metering Equipment & Transformer Sizing

Power Factor

	Resistive Load
	Inductive (Motor) Load
	Capacitors (Power Factor Correction)

Demand and Demand Registers

Determining Present Load, Power Factor, & Horsepower

	Purpose
	Determining Present Load & Power Factor (Self-contained meter)
	Determining Present Load, Power Factor, & Horsepower (Self-contained meter)
	Determining Present Load, Power Factor, & Horsepower (Instrument-rated meter)

Reference Data

	Purpose
	Electrical Term Abbreviations
	Metering Terminology Abbreviations
	Shaft Reduction (Rs) Table
	Meter Forms

Self-Contained Metering Diagrams & Narratives
*Each metering diagram is accompanied by a narrative that includes "Purpose", "Key Points for Metering", and "Common Mistakes".

	Single Phase 2 Wire 120V – Form 1S
	Single Phase 2 Wire 120V – Form 2S Alternate 1
	Single Phase 2 Wire 120V – Form 2S Alternate 2
	Single Phase 3 Wire 120/240V – Form 2S
	Single Phase 3 Wire Network 120/208V – Form 12S
	Three Phase 3 Wire Delta 240V – Form 12S
	Three Phase 4 Wire Delta 120/240 – Form 15S
	Three Phase 4 Wire Wye 120/208 – Form 14S
	Three Phase 4 Wire Wye 120/208 – Form 16S

Instrument-Rated Metering Diagrams & Narratives
*Each metering diagram is accompanied by a narrative that includes "Purpose", "Key Points for Metering", and "Common Mistakes".

	Single Phase 2 Wire 480V – Form 3S
	Single Phase 3 Wire 120/240V – Form 3S
	Single Phase 3 Wire 120/240V – Form 4S
	Three Phase 3 Wire Delta 240V – Form 5S
	Three Phase 3 Wire Delta 480V – Form 5S
	Three Phase 4 Wire Delta 120/240V – Form 8S
	Three Phase 4 Wire Delta 120/240V – Form 5S
	Three Phase 4 Wire Wye 120/208V – Form 6S
	Three Phase 4 Wire Wye 277/480V – Form 6S
	Three Phase 4 Wire Wye 120/208V – Form 9S
	Three Phase 4 Wire Wye 277/480V – Form 9S
	Three Phase 4 Wire Wye 120/208V – Form 5S
	Three Phase 3 Wire Delta - Form 5S (Primary Metering)
	Three Phase 4 Wire Wye - Form 9S (Primary Metering)