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Enclosure Requirements in IEC 61010: More Than an IP Number
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An enclosure in IEC 61010 is assessed for three separate purposes: protection against contact with hazardous live parts, protection of the internal insulation from pollution, and mechanical robustness. An IP rating addresses the first two partially, but the standard has its own probes and its own acceptance criteria, and an IP number alone does not satisfy them.
Access probes
The standard uses jointed test fingers and rigid test pins to check that openings do not admit a finger or a tool to a hazardous part. The probes are applied without force beyond the specified value, in every orientation that the opening permits. An opening that passes a straight probe can fail when the jointed finger is articulated through a bend, which is why the jointed probe exists.
Pollution protection
Ventilation openings admit dust, and dust changes the pollution degree at the insulation behind them. The usual response is a filter, an internal barrier, or a lower declared pollution degree only in the protected region. Declaring a lower degree without a barrier is a paperwork solution to a physical problem.
Mechanical robustness
Impact and drop tests check that the enclosure does not crack or deform enough to reduce clearances. A moulding that survives the impact but deforms permanently can reduce a clearance that was compliant at the design stage, so the inspection after the test matters as much as the test itself.
