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The Classifications as follows:- Class I and Class II
Class I:
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Is the most common type; its safety is dependent on the integrity of its one layer of insulation and the earth bonding of its metalwork. |
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If there is an insulation fault, the metalwork is entirely dependent on the integrity of the earth bonding if it is not to attain a hazardous voltage. |
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Inspection of the earthing conductors and connections are very important where this type of equipment is used. |
Class II:
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There is no earth connection on this equipment and the operator’s safety is dependent on the integrity of two layers of insulation. |
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The first layer is basic or functional insulation and the second layer is supplementary or protective insulation. |
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In some cases a single insulation layer is allowed if it is mechanically and electrically equivalent to double insulation. |
Class II equipment is marked with the symbol of a square within a square.
For further information send for:- The Safe use of Portable Electrical Apparatus (electrical safety).
From the Health and Safety Executive.
Health and Safety Risk - Assessments - Insurance Linked - Analyses Accidents - COSHH - Health and Safety Audit - Permit to Work