HD 393 S1:1979

Outside diameters of conduits for electrical installations and threads for conduits and fittings (without Appendix)

Scope

This recommendation covers outside diameters of conduits for electrical installations and threads for conduits and fittings - They apply to all kinds of conduits for electrical installations, independent of their material and their nature (rigid or flexible, plain or threaded), taking into consideration all existing conduit entries and the metric threads