There should be sufficient spacing between live parts and adjacent metal parts. By measurement, the creepage distance and clearance should not be less than the values ​​specified in the table below .
Creepage distance and clearance | Class 0 and I lamps | Class II lamps | Class III lamps | |||||
Working voltage ( V ) (not exceeding) | twenty four | 250 | 500 | 1000 | twenty four | 250 | 500 | |
Between different live parts | 2 | 3 | 4 | 6 | 2 | 3 | 4 | 2 |
Creepage distance between live parts and accessible metal parts, or on accessible surfaces of live parts and externally insulated parts (if it is an insulating material, it may be the outer surface of the luminaire) gap | 2 2 | 4 3 | 5 5 | 6 6 | 2 2 | 8 8 | 10 10 | 2 2 |
Between a live component and an accessible metal component due to the destruction of functional insulation in a Class II luminaire | - | - | - | - | 2 | 4 | 5 | - |
Between the outer surface of the flexible cord or the flexible cable and the accessible metal, the accessible metal is secured by a corded knot made of an insulating material, a cable support or a clamp | - | - | - | - | - | 4 | 5 | - |
After removing the insulating gasket (if any) near the switch, it is installed between the live parts of the switch and the adjacent metal parts. | - | 2 | - | - | - | 4 | - | - |
Between the live parts and other metal parts, there is no such thing as between these parts (or live or uncharged metal parts) and the support surface (ceiling, wall table, etc.): a. Â Â Â Â Â Â Power supply insulation is less than b. Â Â Â Â Â Â Through thickness is not less than | 2 - | 6 4 | 8 6 | 10 8 | 2 - | 8 6 | 10 8 | 2 - |
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