This part of PS 76 applies to boxes, enclosures and parts of enclosures (hereafter called "boxes" and "enclosures") for electrical accessories with a rated voltage not exceeding 1 000 V AC and 1 500 V DC intended for household or similar fixed electrical installations, either indoors or outdoors.

Boxes and enclosures complying with this document are suitable for use at ambient temperatures not normally exceeding +40 °C, but their average over a period of 24 h does not exceed +35 °C, with a lower limit of the ambient air temperature of −5 °C.

Other temperatures outside the above range can apply according to the classification of the boxes and the enclosures.

This document applies to boxes and enclosures for ceiling and wall mounting with provision for suspension means.

This document is intended to apply to boxes and enclosures for electrical accessories within the scope of IEC technical committee 23.

A box or an enclosure which is an integral part of an electrical accessory and provides protection for that accessory against external influences (for example mechanical impact, ingress of solid objects or water, etc.) is covered by the relevant standard f or such an accessory.

This document gives test requirements for boxes and enclosures declared with IK code, see Annex B (normative).

This document also applies to types of boxes and enclosures as modified in PS 76-21, PS 76-22, PS 76-23, and PS 76-24.

This document does not apply to:

• ceiling roses;
• luminaire supporting couplers;
• boxes, enclosures and parts of enclosures specifically designed to be used for cable trunking and ducting systems complying with PS 947 and which are not intended to be installed outside of these systems.