BS EN 60423:2007 – Conduit systems for cable management — Outside diameters of conduits for electrical installations and threads for conduits and fittings

1 Scope
This International Standard specifies outside diameters for conduits used in electrical installations or in communication systems and the dimensional requirements for threads. It also specifies the dimensional requirements for threads used in associated fittings. It is not applicable to extra heavy-duty electrical rigid steel conduits specified in IEC 60981 .
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 68-1 :1 998, ISO general purpose screw threads – Basic profile – Part 1: Metric screw threads ISO 965-1 :1 998, ISO general-purpose metric threads – Tolerances – Part 1: Principles and basic data ISO 1 502:1 996, ISO general-purpose metric screw threads – Gauges and gauging
3 Outside diameters and threads The outside diameters, tolerances and details of threadable conduit and external and internal metric threads are given in Table 1 . Details of the thread form are given in Figure 1 , which is based on ISO 68-1 and ISO 965-1 . Outside diameters and tolerances of non-threadable conduit are given in Table 2.
4 Gauges External threads are checked by means of threaded GO ring gauges and plain NO-GO ring gauges specified in ISO 1 502. Internal threads are checked by means of threaded GO plug gauges and plain NO-GO plug gauges specified in ISO 1 502. Outside diameters of threadable conduits are checked by means of GO ring gauges specified in Figure 2 and NO-GO gap gauges specified in Figure 3a for threadable rigid metal conduits, or NO-GO ring gauges specified in Figure 3b for threadable conduits other than rigid metal.
BS EN 60423:2007 – Conduit systems for cable management — Outside diameters of conduits for electrical installations and threads for conduits and fittings