BS 1363-4:2023 - Page 2

13 A plugs, socket-outlets, adaptors and connection units. Part 4: 13 A fused connection units: switched and unswitched – Specification | Status: Current

1 Scope This part of BS 1363 specifies requirements for 13 A fused fixed connection units for household, commercial and light industrial purposes, with particular reference to safety in normal use. The connection units are suitable for the connection of appliances, in a.c. circuits only, operating at voltages not exceeding 250 V r.m.s. and frequencies from 50 Hz to 60 Hz. Requirements are specified for connection units incorporating a fuse‑link conforming to BS 1362:1973+A3:2021. Requirements are specified for 13 A connection units with or without associated controlling switches, for flush mounting in suitable enclosures, e.g. boxes conforming to BS 4662, or for surface or panel mounting. Connection units are intended for use with cables conforming to BS 6004 having copper conductors. Connection units with cable outlets are additionally intended for use with flexible cables, conforming to the relevant part of BS EN 50525 on the load (output) side. This standard does not apply to connection units incorporating screwless terminals for the connection of external conductors of the following types:

1. a) flat quick‑connect terminals;
2. b) insulation‑piercing connecting devices; and
3. c) twist‑on connecting devices.

Certain installations require the inclusion of intumescent and acoustic pads and this might have an effect on the conformance of the connection unit to the requirements of this standard. This might influence temperature rise and internal clearances. Verification of suitability of the connection unit needs to be obtained from the manufacturer.

NOTE Requirements for electromagnetic compatibility are not given for the following reason:

A connection unit is mechanical by nature of construction. A connection unit does not emit intolerable electromagnetic interference and the product is immune from electromagnetic interference.