120/208 V vs 347/600 V in Calgary | Calgary Commercial Electrician

CCT 01Read the paired voltage notation

In a wye system, the paired description refers to line-to-neutral and line-to-line voltage. The familiar 120/208 V and 347/600 V descriptions identify different supply arrangements. They are not interchangeable settings for equipment. A qualified designer should verify the actual system and the equipment requirements.

CCT 02Start with equipment requirements

Obtain the manufacturer’s nameplate and installation documents for motors, heaters, kitchen equipment and chargers. Include phase, frequency, power and starting characteristics as relevant. Do not assume that equipment purchased in another market can be connected to the premises without modification.

CCT 03Understand why transformation appears

A building can distribute at one voltage and use transformers to serve loads requiring another. That creates additional equipment, space, ventilation, protection and maintenance requirements. Compare the complete arrangement rather than only the current rating of the main service.

CCT 04Compare power on a common basis

For a balanced three-phase load, apparent power relates to line voltage and line current through the square-root-of-three relationship. The calculator shows that arithmetic. It does not determine conductor sizes, protection, spare capacity or the correct equipment for an installation.

CCT 05Check the whole supply path

The main service, transformer, feeder, distribution panel and equipment branch circuit can each limit a proposed addition. Spare physical breaker spaces do not prove capacity. Ask for the qualified assessment that supports the proposed load rather than relying on the panel label alone.

CCT 06Keep procurement and design aligned

Make the approved supply requirements part of the purchase order. Have substitutions reviewed before delivery. Store the final equipment schedule and drawings so later replacements do not repeat a voltage or phase mismatch.

CCT 07Put the guide to work

Related scope: Three-phase power. Budget context: Three-phase power cost. Explore the Three-phase kVA & amps tool for planning arithmetic.

These pages concern Calgary. Confirm the authority and wire-service provider for Airdrie, Rocky View County or another neighbouring municipality. The applicable permits and connection process may differ.

Electrical safety

This is planning information, not instructions for electrical work. Do not open equipment, approach exposed energized parts or attempt repairs. Use qualified professionals and an appropriate safety plan. For immediate danger, fire or a person in contact with electricity, call 911.

Questions people ask

What should I provide to obtain a useful quotation?

Describe the building, existing system, intended outcome, drawings status and operating constraints. For 120/208 v vs 347/600 v, include the equipment and documents identified in this guide. Ask the bidder to state assumptions and exclusions.

Does this website carry out electrical work?

No. Calgary Commercial Electrician is a planning reference. It does not employ an installation crew, hold itself out as an electrical contractor or certify contractors. Any installation agreement is with the contractor you choose.

Can a calculator replace a design or load calculation?

No. The tools show planning arithmetic and assumptions. They do not establish code compliance, available capacity, conductor sizes or protective-device settings. Have the proposed work assessed by qualified professionals.

Can the work happen while the building stays occupied?

That depends on the system, scope and safe work plan. Explain which operations must continue and which interruptions can be arranged. Have the contractor and responsible designer identify shutdown and temporary-service requirements before agreeing a schedule.

Sources and further reading

Use the official links in this guide and the editorial standards. Scope and procurement checklists are editorial planning guidance, not quotations or installation instructions.