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‚ÄčUpdated May 2017

Aerial Area

Parts of a region where electricity is delivered with overhead power lines.

Blast Wall

A heavy wall used to isolate buildings or areas that contain highly combustible or explosive materials, or to protect a building or area from blast damage when exposed to explosions.

Civil Work

The completion, installation, repair, or replacement of ductwork, trenching, ground disturbance, electrical equipment, guardrails, manholes, vaults, pull boxes, or landscaping on property owned by the customer.


The maximum rate at which energy is delivered (expressed in kW, kVA, or other suitable unit) at a given instant, or averaged over any designated period of time.

Distribution Tariff

A distribution fee or charge prepared by EDTI and approved by the Alberta Utilities Commission.


EDTI Distribution and Transmission Inc., the electrical division of EPCOR.


Fluctuating electrical loads that lead to a noticeable change in the output of various devices.

Harmonic Load

A total amount of a portion of the voltage that is a multiple of the fundamental wave frequency.

Horizontal Clearance

The distance measured horizontally from electrical equipment.

Instrument Transformer

High-accuracy current or voltage transformers used for revenue metering.

Interrupting Capacity

The highest current at rated voltage that the device can interrupt.


Kilovolt or kilovolts.


Kilovolt-amp or kilovolt-amps.


Kilowatt or kilowatts.


Kilowatt hour or kilowatt hours.

Line Side

The side that is located toward EDTI's system.


The demand and energy required to operate equipment.

Load Customer

A person interconnected to EDTI's electric distribution system for the purpose of purchasing electricity for their own use.

Load Side

The side that is located toward the customer's equipment.


A covered opening, generally on a street, that provides access for maintenance or repairs to underground electrical systems.


One thousand circular mils.

Meter Socket

A meter-mounting device for installing a self-contained meter.

Minnesota Mounds

An above-ground mound of dirt used for septic systems.

Padmount Transformer

A ground-level transformer that sits on a concrete base.


A grade-mounted utility box that houses connections and switches for electrical connections.

Point of Service

The electrical connection point at which EDTI's service conductors are connected to the conductors or apparatus of a customer.

Pole-Mounted Transformer

A transformer mounted on a utility pole.

Power Factor

The efficiency of an electrical circuit to deliver usable power.

Primary Conducter

A high-voltage utility conductor in excess of 750 V.

Primary Duct

A conduit in which high-voltage conductors are installed.

Primary Fault

A short-circuit in the high-voltage distribution system.

Pull Box

An intermediate enclosure in a conduit system to aid in the installation of circuit conductors.


A company that sells or provides retail electricity services directly to customers.

Secondary Conductor

A low-voltage wire or combination of wires that carries an electrical current at 750 V or less.

Secondary Duct

A conduit in which low-voltage conductors are installed.

Secondary Fault

A short-circuit in the secondary system.

Self-Contained Meter

A meter rated for carrying the total current and voltage of the circuit.

Service Connection

The point at which the customer's electrical distribution system connects to the utility electrical distribution system.

Service Connection Point

The point at which the customer's facilities physically connect to EDTI's distribution system to permit the customer to obtain electricity. For an underground service, this could also be described as the specific point at which EDTI's civil work ends and the customer's begins.

Setback Distance

The minimum allowable distance to the point where new equipment or other devices can be installed.


The combination of electrical disconnect switches, fuses, or circuit breakers used to control, protect, and isolate electrical equipment.

Switching cubicle

A metallic box that typically sits on the ground and holds a number of electrical switches and devices.


An electromagnetic device used to change the voltage in an alternating current electrical circuit.


A narrow, long ditch embanked with its own soil.


An underground room or contained area that houses electrical equipment.


The entry point where open conductors enter a conduit system.