External Power Supplies

Regulatory Definition

A power supply device that

  • is designed to convert line voltage ac input into lower voltage dc or ac output,
  • is able to convert to only one dc or ac output voltage at a time,
  • is designed to be used with a household or office end-use product that constitutes the primary load,
  • is encased in an enclosure separated from that end-use product and is connected to that product by an electrical connection, and
  • has a nominal output power of 250 W or less;

but does not include a device

  • that powers the charger of a detachable battery pack of an end-use product,
  • that charges the battery of an end-use product that is fully or primarily motor operated,
  • that is an accessory to a medical device as defined in section 1 of the Medical Devices Regulations, or
  • that is a power sourcing equipment as defined in IEEE 802.3-2008 Standard entitled Standard for Information Technology - Telecommunications and Information Exchange Between Systems - Specific requirements Part 3

A security EPS is an EPS

  • that is manufactured before July 1, 2017,
  • is designed to convert line voltage ac input into lower voltage ac output,
  • has a nominal output power of 20 W or more, and
  • is designed for and marketed with equipment that operates continuously in on mode to perform any of the following principal functions:
    • monitor, detect, record or provide notification of any intrusion on or access to real property or physical assets or notification of threats to personal safety resulting from that intrusion or access,
    • deter or control access to real property or physical assets or prevent the unauthorized removal of physical assets, or
    • monitor, detect, record or provide notification of any physical threats to real property, physical assets or personal safety, including fire, gas, smoke and flooding.

It does not include an EPS for equipment that is designed and marketed with a built-in alarm or theft-deterrent feature if the equipment's principal functions are not any of the functions mentioned above.

Compliance date

Manufactured on or after July 1, 2010

Security EPS manufactured prior to July 1, 2017, are exempt from the no-load power requirements.


List of Compliant Models


Test Standard

CSA C381.1 or 10 C.F.R Appendix Z

Energy Efficiency Standard
Nominal (nameplate) output power Minimum average efficiency in active mode (decimal equivalent of a percentage) Maximum power in no-load mode (not applicable to security EPS)
<1 W 0.5 × ln(nameplate output) 0.5 W
≥1 W and ≤51 W 0.09 × ln (nameplate output) + 0.5 0.5 W
>51 W 0.85 0.5 W

Where ln (nameplate output) is the natural logarithm of the nameplate output power which is expressed in watts

Verification Requirements

For EPS, the use of the Roman numeral IV is accepted as an alternative to the energy efficiency verification mark if:

  • the Roman numeral is clearly indicated on the product according to the International Efficiency Marking Protocol, and
  • the product performance is verified by a Standards Council of Canada accredited certification organization with a relevant energy efficiency scope (i.e. offering an EPS energy efficiency verification program.)

Energy Efficiency Report Requirements

  • name of product;
  • manufacturer name;
  • brand name;
  • model number;
  • nominal output, in volts (V), at highest and lowest output setting;
  • nominal output power, in watts (W), at highest and lowest output setting, if applicable;
  • whether the output is ac or dc;
  • average efficiency at highest and lowest power output setting;
  • no load power, in watts (W);
  • whether it is a security EPS;
  • if a security EPS, the end-use equipment and the brand and model number of that equipment;
  • Roman numeral mark, if applicable;
  • whether the product bears an energy efficiency verification mark; and
  • name of the certification body associated with verifying the Roman numeral mark or that authorized the verification mark that will appear on the product.

Download the energy efficiency reporting template.

This document does not constitute part of the Energy Efficiency Act (Act) or its associated regulations.  This document is an administrative document that is intended to facilitate compliance by the regulated party with the Act and its associated regulations.  This document is not intended to provide legal advice regarding the interpretation of the Act or its associated regulations. If a regulated party has questions about their legal obligations or responsibilities under the Act or its associated regulations, they should seek the advice of legal counsel.