CSA C22.2 No. 84-05 (2015): Comprehensive Guide to Industrial Control Equipment Safety in Canada

Introduction and Scope

CSA C22.2 No. 84-05 (2015), titled Industrial Control Equipment, is a mandatory safety standard within the Canadian Electrical Code, Part II framework. It covers industrial control devices and assemblies intended for installation in ordinary (non‑hazardous) locations in accordance with the Canadian Electrical Code, Part I. The standard applies to equipment rated for use on supply circuits at voltages up to 600 V ac or 750 V dc, with a general application scope including motor controllers, contactors, starters, control relays, pilot devices, and similar apparatus.

First published in 2005 and reaffirmed in 2015, this edition harmonizes closely with UL 508, the corresponding U.S. standard, facilitating cross‑border certification. The scope encompasses both open‑type and enclosed equipment, as well as modular systems intended for use in industrial environments. The primary objective is to minimize the risk of fire, electric shock, and mechanical injury under normal and fault conditions.

Technical Requirements and Design Specifications

Electrical Insulation and Spacings

A core set of requirements addresses dielectric withstand, clearance, and creepage distances. The standard specifies minimum values based on impulse withstand voltage (rated impulse voltage) and pollution degree. For equipment operating at voltages up to 600 V ac, the minimum clearances are derived from Table 4 of the standard, which are consistent with IEC 60947‑1 for rated impulse voltages of 2.5 kV to 8 kV.

Designers must also account for creepage distances that follow the surface profile of insulating materials, with specific requirements for materials of different comparative tracking index (CTI). The standard mandates dielectric voltage‑withstand tests (e.g., 2× rated voltage + 1000 V) and impulse tests for circuits subject to transient overvoltages.

Short‑Circuit Current Ratings (SCCR)

CSA C22.2 No. 84‑05 requires that industrial control equipment be marked with a short‑circuit current rating (SCCR) in amperes, at a stated voltage. This rating defines the maximum prospective fault current the equipment can withstand when protected by a specified overcurrent protective device (OCPD). The standard provides testing protocols (e.g., fault simulation at the marked SCCR) and allows for the use of series‑rated combinations listed with recognized OCPDs.

For equipment that contains solid‑state components, the SCCR testing must ensure that any semiconductor failure does not result in a fire or electric shock hazard. The standard also permits the use of current‑limiting devices to raise the SCCR of a combination.

Enclosure and Environmental Protection

Enclosed equipment must meet the requirements of CSA C22.2 No. 94.1 (Enclosures for Electrical Equipment) or equivalent. The standard defines minimum degrees of protection (IP or NEMA type) based on the intended application. For general‑purpose indoor use, an IP20 (NEMA 1) enclosure is typical; for wet or dusty environments, IP54 (NEMA 12) or higher is required. All enclosures must pass rigid impact, corrosion, and gasket aging tests.

Temperature rise limits are specified for various components: coils, resistors, power semiconductors, and busbars. For instance, the maximum allowable temperature rise for insulated copper windings is 85 K when measured by resistance, under rated continuous load. Thermal tests are performed at maximum ambient temperature (usually 40 °C).

Implementation and Testing Highlights

To demonstrate conformity, manufacturers must subject their equipment to the following type tests:

• Dielectric voltage‑withstand test – 60 Hz or dc voltage applied between live parts and ground, and across open contacts.
• Impulse voltage withstand test – 1.2/50 μs impulse at levels matched to the rated impulse voltage.
• Short‑circuit test – At the equipment’s marked SCCR, with three successive fault operations allowed.
• Overload and endurance tests – For contactors and motor controllers, typically 50 operations at six times rated current, followed by 6000 no‑load operations.
• Temperature rise test – Continuous rated current until thermal stabilization.
• Enclosure tests – Impact (5 J for general purpose), gasket aging (70 °C, 7 days), and corrosion (salt spray if required).

Routine production tests are required for each unit: a dielectric withstand test at 1000 V (or 1.2× the type‑test voltage) and a ground‑bond continuity test.

Compliance and Certification Considerations

Certification to CSA C22.2 No. 84‑05 (2015) is mandatory for industrial control equipment sold in Canada, as the standard is referenced by provincial/municipal electrical codes. Certification is typically performed by accredited bodies such as CSA Group, UL (under the binational CSA/UL scheme), or Intertek. The certification process involves:

1. Review of component and material certifications (e.g., recognized components, PCB flammability).
2. Witnessing of type tests at the manufacturer’s facility or at a certified laboratory.
3. Periodic factory inspections to ensure ongoing conformity.

Marking requirements include the manufacturer’s name, catalogue number, electrical ratings, SCCR, enclosure type, and the certification mark (e.g., CSA mark). Field‑installable accessories must be listed separately or covered within the equipment’s certification report.

It is important to note that the 2015 reaffirmation did not introduce new technical requirements but confirmed the ongoing validity of the 2005 edition. However, manufacturers should monitor future revisions (e.g., the expected alignment with IEC 60947‑4‑1 for motor starters) that may require updated testing.

Frequently Asked Questions

Article prepared for informational purposes. Always refer to the latest official version of CSA C22.2 No. 84‑05 (R2015) and consult a certified testing laboratory for formal compliance evaluation. © 2026