A digital voltage phasing meter is used by qualified electrical workers to measure high-voltage circuit potential and compare voltage between energized conductors.

The Hastings 6702 Digital Voltage Phase Meter is designed for overhead and underground electrical systems. It can measure phase-to-phase and phase-to-ground voltage, help confirm whether two conductors are on the same phase, and support underground residential distribution, or URD, cable testing when used with the correct accessories.

The standard meter measures up to 40 kV AC in line-voltage mode. Paired extension resistors can increase the operating range in 40 kV increments, up to 240 kV. The current manufacturer manual also lists direct DC measurement up to 4 kV.

For Canadian utilities, electrical contractors, industrial facilities and power-system maintenance teams, this type of instrument can support:

• Overhead distribution-system testing
• Underground cable-system testing
• Phase identification
• Phase-to-phase voltage measurement
• Phase-to-ground voltage measurement
• Potential testing
• Verification work during switching and maintenance
• Limited cable-integrity testing with the designated DC Hi-Pot adapter

Because the meter is used directly on high-voltage systems, it must only be operated by trained and qualified personnel following an approved electrical safety procedure.

What Is a Digital Voltage Phasing Meter?

A digital voltage phasing meter is a high-voltage instrument that measures the electrical potential difference between two points.

The Hastings 6702 consists of high-voltage resistors encapsulated inside two fibreglass housings. The two sides are connected by a coiled cable, and a digital display is mounted on one of the housings. Each housing must be attached to a hot stick of suitable length for the system voltage and work procedure.

The instrument can be used to compare:

• One phase with another phase
• A phase conductor with ground
• Two cable terminations
• Overhead conductors
• Underground distribution bushings when suitable adapters are fitted

During phasing work, the technician compares the voltage between two energized points. A low potential difference may indicate that both points are on the same phase, while a normal phase-to-phase voltage may indicate that the points are on different phases. The actual interpretation must account for the system configuration, nominal voltage and approved utility or facility procedure.

A phasing meter does not eliminate the need for system knowledge. The person performing the test must understand the circuit, expected voltage, test points, equipment limitations and possible induced or backfeed conditions.

Hastings 6702 Digital Voltage Phase Meter

The Hastings 6702 is built around two high-voltage resistor assemblies connected by a self-retracting coiled cable.

Its primary functions include:

• High-voltage AC potential measurement
• DC voltage measurement within the instrument’s specified range
• Phase-to-phase measurement
• Phase-to-ground measurement
• Phasing of electrical circuits
• Underground distribution cable testing with designated accessories

The standard line-voltage range is 0–40 kV AC. The manufacturer’s manual lists a DC measurement range of 0–4 kV and operation on 50 Hz and 60 Hz AC systems.

Main Features

Automatic Self-Test

The meter performs an automatic self-test and battery-voltage check during startup.

The probe ends or installed extension-resistor ends must be positioned according to the manufacturer’s instructions during startup. If the meter does not complete the self-test successfully, it should not be used.

This is a critical control. A display turning on does not by itself prove that a high-voltage instrument is functioning correctly.

Large Backlit Digital Display

The instrument has a large digital display with a selectable backlight.

Measured voltage is displayed numerically and through a voltage-range bar graph. The display also shows the maximum configured voltage range, which helps the operator confirm whether the meter has recognized installed extension resistors.

Three Operating Modes

The current Hastings 6702 manual identifies three available operating modes:

• AC
• Hi-Pot
• DC

Hi-Pot mode requires the approved DC Hi-Pot adapter. Selecting the wrong mode for the voltage being measured can produce an error indication or prevent the instrument from displaying the system voltage correctly.

Rugged Housing

The resistor assemblies are enclosed in fibreglass housings, while the display assembly uses a rugged extruded aluminium enclosure.

The complete meter weighs approximately:

• 1.72 kg without probes
• 1.81 kg with probes

These values are converted from the manufacturer’s listed weights of 3.8 and 4.0 pounds.

Coiled Connecting Cable

The original article describes the connecting cable as approximately 406 mm when retracted and 3.05 metres when fully extended.

The coiled design helps keep the cable manageable while allowing sufficient separation between the two hot-stick assemblies during testing.

The cord must be kept away from nearby energized or grounded objects where possible. Hastings specifically warns that conductive objects near the meter can affect AC measurement accuracy.

Measuring Circuit Potential

The Hastings 6702 can measure high voltage across two points on an electrical system.

Common configurations include:

Phase-to-Phase Testing

The meter is connected between two phase conductors using appropriate hot sticks and approved contact probes.

The displayed value represents the potential difference between the two test points. This can help workers identify conductor phase relationships and confirm expected system voltage.

Phase-to-Ground Testing

One side of the meter is placed on the phase conductor and the other at the approved ground reference point.

This allows the worker to measure the phase-to-ground potential within the instrument’s rated range.

Overhead Voltage Testing

The instrument can be fitted with suitable probes and mounted on properly selected hot sticks for overhead distribution-system work.

Hot-stick length, condition and electrical rating must match the voltage and work environment. The meter manufacturer expressly requires its use with hot sticks of an appropriate length for the potential being tested.

Underground Voltage Testing

Underground bushing adapters are available for specified 15 kV, 25 kV and 35 kV underground distribution bushings.

The correct adapter depends on the bushing manufacturer, voltage class and connection style. Only accessories approved for the Hastings meter should be used.

Extended Voltage Ranges

The standard Hastings 6702 is configured for measurements up to 40 kV AC.

For higher-voltage systems, paired Hastings 6703 extension resistors can be installed. They must be used in matched pairs, with one resistor added to each side of the meter.

The manufacturer lists the following ranges:

The extension-resistor ends must remain in contact with one another during startup so the meter can recognize the installed configuration and select the correct range.

Do not treat extension resistors as generic accessories. The multiplying factor, installation arrangement and meter startup process are part of the measurement system.

DC Hi-Pot Adapter

The Hastings DC Hi-Pot adapter is an encapsulated high-voltage rectifier designed for use with designated Hastings phase meters, including the 6702.

When fitted correctly and operated in Hi-Pot mode, it can support underground cable testing on applicable systems up to 35 kV phase-to-phase, according to the original JM Test article.

The adapter can be used for two main purposes.

1. Identifying Failed Underground Cable Sections

The adapter rectifies the available AC voltage and charges the cable to a DC voltage corresponding to the peak AC voltage supplied.

This can help identify cable sections with failed insulation. The meter limits the available current, but this does not make the procedure risk-free or interchangeable with a full diagnostic cable-testing programme.

The result should be interpreted within the approved utility, manufacturer or engineering procedure.

2. Checking Whether Grounds Have Been Removed

The source article also describes using the adapter to help determine whether temporary grounds remain connected after work on a de-energized underground system.

This should not be treated as a casual substitute for a controlled grounding-removal and switching process. Ground installation and removal must remain documented, verified and controlled under the site’s electrical safety procedure.

Important Operating Limits

The current Hastings manual lists the following core specifications:

The instrument’s field accuracy can be affected by nearby conductive objects. Keeping the coiled cord and meter assemblies away from adjacent structures or conductors helps reduce measurement influence.

Safety Considerations

This equipment is designed for direct use around lethal high voltage.

The manufacturer states that it must only be used by trained personnel familiar with high-voltage devices. It also requires an appropriate hot stick, successful startup self-test and caution around nearby grounded or energized objects because the meter body will be at elevated potential during use.

Canadian work should be completed under:

• The employer’s documented electrical safety programme
• Applicable federal, provincial or territorial occupational safety requirements
• Utility or facility switching procedures
• Shock and arc-flash risk assessments
• Approved PPE requirements
• Hot-stick inspection and testing requirements
• Manufacturer instructions
• Applicable authority-having-jurisdiction requirements

CSA Z462 provides requirements and guidance for electrical safety management systems, safe work procedures, PPE selection and identification and training of qualified electrical workers exposed to energized electrical equipment.

Important precautions include:

• Inspecting the meter and accessories before use
• Confirming the instrument passes its startup self-test
• Using the correct operating mode
• Installing extension resistors only in approved pairs
• Using correctly rated and tested hot sticks
• Maintaining required approach distances
• Controlling the work zone
• Keeping the coiled cable clear of nearby conductive objects
• Using only manufacturer-approved probes and adapters
• Confirming the expected voltage before contact
• Removing the meter according to the approved sequence

This article is educational content, not a high-voltage operating procedure.

Why Digital Phasing Meters Are Useful

Traditional analogue phasing meters require the operator to interpret a moving pointer and scale.

A digital instrument provides a direct numerical voltage reading, helping reduce ambiguity during potential testing. Features such as automatic self-testing, range recognition, backlighting and error indications also give the operator more information about instrument condition and configuration.

The operational value is not merely having a digital screen. It is reducing uncertainty at a point in the job where uncertainty is dangerous.

Digital phasing meters can help qualified teams:

• Confirm conductor phase relationships
• Verify expected circuit voltage
• Check overhead and underground systems
• Reduce dependence on visual analogue-scale interpretation
• Support switching and commissioning work
• Document measured potential more clearly
• Work with a broader range of system voltages using approved extensions

Practical Takeaway

The Hastings 6702 Digital Voltage Phase Meter is designed for high-voltage potential measurement, circuit phasing and underground distribution testing.

In its standard configuration, it measures up to 40 kV AC. Paired extension resistors increase the range up to 240 kV, while approved bushing and DC Hi-Pot adapters expand its use for underground systems. The current manufacturer manual also lists direct DC measurement up to 4 kV.

The instrument’s usefulness depends on more than its range. Correct mode selection, successful self-testing, appropriate hot sticks, approved accessories, work-zone control and qualified interpretation are all essential.

JM Test Systems Canada can support electrical teams with digital voltage phasing meters, hot sticks, underground bushing adapters, high-voltage test equipment, rental options and related calibration or inspection services.