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Associated with product safety, the CE mark is attached to certain products in accordance with EU legislation. By attaching the CE mark, the manufacturer declares that the product in question complies with the applicable European directives. However, it is not possible to conclude from a CE mark alone whether independent bodies have checked the product's compliance with the directives. A four-digit number appearing after the CE mark indicates that a Notified Body was involved in the conformity assessment procedure. The CE mark is not a seal of quality.

Voltage rating for cables varies between standards. Typical voltage ratings for cables are 300V and 600V.

CE requires the equipment or other installations to have insulation rating equal to the maximum circuit voltage applied to any conductor within the cable or raceway.