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CSA C22.2 No. 155-M1986 (2017): Safety Requirements for Electric High-Pressure Cleaning Appliances
A Detailed Technical Analysis of Scope, Testing, and Compliance for Electric Pressure Washers under the Canadian Electrical Code Part II
CSA C22.2 No. 155-M1986 (2017) is a mature standard under the Canadian Electrical Code Part II (CE Code) addressing the safety of electric high-pressure cleaning appliances. Originally published in 1986 and reaffirmed in 2017, it sets mandatory requirements for the construction, performance, and testing of electrically powered pressure washers and similar cleaning equipment. This article examines the standard’s scope, core technical provisions, and practical compliance pathways.
1. Scope and Application
The standard applies to portable and stationary electric high-pressure cleaning appliances intended for use in non-hazardous indoor or outdoor locations in accordance with the CE Code. Covered appliances include:
- Cold-water electric pressure washers (rated up to 250 V single-phase or 600 V polyphase)
- Hot-water pressure cleaning units with integral heating elements
- Accessories such as spray guns, hoses, and detergent injection systems
Excluded are appliances for use in explosive atmospheres, medical devices, or industrial processes where water pressure exceeds 50 MPa without special provisions. The ambient temperature range for compliance is –10 °C to +40 °C.
Note: CSA C22.2 No. 155-M1986 (2017) requires that cleaning appliances bear a conspicuous marking indicating the maximum allowable working pressure and the electrical ratings per the nameplate. Compliance with this marking clause is the first step in certification.
2. Technical Requirements
2.1 Electrical Insulation and Grounding
All live parts must be enclosed within insulation systems meeting specified creepage and clearance distances. Table 1 summarises the key dielectric test parameters derived from the standard.
| Parameter | Requirement | Test Condition |
|---|---|---|
| Rated voltage | ≤ 250 V (single-phase) / ≤ 600 V (polyphase) | Nameplate marking |
| Grounding continuity | ≤ 0.1 Ω | 30 A, 60 Hz, 60 s |
| Basic insulation dielectric strength | 1250 V (single-phase) / 1500 V (polyphase) | 60 s, no breakdown or flashover |
| Leakage current (Class I) | ≤ 0.5 mA at rated voltage | Isolation transformer method |
| Clearance / creepage distances | ≥ 3.2 mm (basic) / ≥ 6.4 mm (reinforced) | Measured per IEC 60950-1 extrapolation |
Class I appliances must incorporate a bonded grounding conductor that routes fault current safely. Class II (double-insulated) appliances are permitted if marked accordingly and meet stricter insulation tests (e.g., 2500 V dielectric test).
2.2 Environmental Protection
Because high-pressure cleaning appliances handle water, the standard mandates protection against moisture ingress and corrosion. Key environmental clauses include:
- IP rating: The appliance enclosure must achieve at least IPX4 (splash‑proof). For units intended for continuous outdoor use, IPX5 (water jet) is required.
- Hose integrity: Supply hoses and spray hoses must withstand 1.5× the rated working pressure without rupture. End fittings must resist corrosion after a 96‑h salt‑spray test (ASTM B117).
- Thermal protection: Motors and heating elements (if present) must be protected by automatic thermal cut‑outs. Reset type must be manual for hot‑water units.
Engineering Tip: When designing the pump housing, ensure the drain holes are provided at the lowest point to prevent water accumulation. Clause 6.5.3 of CSA C22.2 No. 155 explicitly requires no standing water inside the enclosure after the appliance is tilted 15° from normal position.
2.3 Control Systems and Safety Interlocks
Start/stop controls must be mounted such that they are not inadvertently actuated. The standard also requires:
- Two‑hand operation for guns with a lock‑on device (trigger safety).
- Automatic shut‑off when the spray trigger is released (dead‑man function).
- Over‑pressure relief valve set to open at ≤ 110 % of rated pressure.
Critical Compliance Issue: The standard prohibits the use of aluminium or copper wire for ground connections inside the wet section. Corrosion of such materials has led to intermittent ground paths and severe shock hazards. Use tinned copper or stainless steel for all grounding hardware inside water‑exposed areas.
3. Compliance and Certification
Manufacturers seeking certification for their high‑pressure cleaning appliances must submit samples to an accredited testing laboratory (e.g., CSA Group, UL, Intertek). The compliance process includes:
- Documentation review: Electrical schematics, parts lists, and rating labels must comply with Clause 5 (Markings) and Clause 9 (Instructions).
- Type testing: Dielectric, leakage, thermal, and water‑ingress tests are performed on three representative units.
- Factory inspection: Annual follow‑up inspections verify production line consistency, especially for grounding integrity and wire sizing.
Best Practice: Use a 100 % in‑line high‑potential (hipot) tester on the assembly line. This allows you to detect insulation faults before the product leaves the factory, greatly reducing the risk of a failed certification audit.
Reaffirmation in 2017 did not introduce drastic changes; however, updated references to IEC 60417 symbols for safety signs and revised marking requirements for dual‑voltage appliances were incorporated. Manufacturers complying with earlier editions should review the 2017 addendum.
4. Frequently Asked Questions
Q: Can a Class II (double‑insulated) pressure washer be certified to this standard?
A: Yes. Clause 4.2 permits double‑insulated construction provided that leakage current is ≤ 0.25 mA and the dielectric test voltage is raised from 1250 V to 2500 V. The nameplate must indicate “Class II” or the double‑square symbol (IEC 60417-5172).
A: Yes. Clause 4.2 permits double‑insulated construction provided that leakage current is ≤ 0.25 mA and the dielectric test voltage is raised from 1250 V to 2500 V. The nameplate must indicate “Class II” or the double‑square symbol (IEC 60417-5172).
Q: Does CSA C22.2 No. 155 apply to battery‑operated pressure washers?
A: The standard primarily covers mains‑connected corded appliances. However, battery‑powered units with a built‑in charger that connects to the supply are subject to the full standard during charging mode. For pure cordless operation the standard is applied analogously, focusing on over‑pressure and interlock functions.
A: The standard primarily covers mains‑connected corded appliances. However, battery‑powered units with a built‑in charger that connects to the supply are subject to the full standard during charging mode. For pure cordless operation the standard is applied analogously, focusing on over‑pressure and interlock functions.
Q: What is the relation between CSA C22.2 No. 155 and UL 1776?
A: UL 1776 (High‑Pressure Cleaning Machines) is the U.S. equivalent. The two standards are technically harmonised through the CAN/CSA‑C22.2 No. 155–UL 1776 bi‑national agreement. A product certified to either standard often meets the requirements of both, though local markings and Canadian code deviations (e.g., allowance for 600 V polyphase) must be verified.
A: UL 1776 (High‑Pressure Cleaning Machines) is the U.S. equivalent. The two standards are technically harmonised through the CAN/CSA‑C22.2 No. 155–UL 1776 bi‑national agreement. A product certified to either standard often meets the requirements of both, though local markings and Canadian code deviations (e.g., allowance for 600 V polyphase) must be verified.
Q: How often must a certified appliance be re‑evaluated?
A: Certification is ongoing. Facilities are subject to periodic unannounced factory inspections, typically every 12 months, to verify that production units continue to conform. Any significant design change (e.g., a new pump type) requires a new submission for evaluation.
A: Certification is ongoing. Facilities are subject to periodic unannounced factory inspections, typically every 12 months, to verify that production units continue to conform. Any significant design change (e.g., a new pump type) requires a new submission for evaluation.
— Published: March 2026 —