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IEC 60981:1989 ed1.0

Заменен
Extra-heavy duty rigid steel conduits for electrical installations — 25 стр.
Specifies requirements for EHDRS (Extra Heavy Duty Rigid Steel) conduits for electrical installation, and for threads for these conduits and fittings,
ICS
29.120.10 Conduits for electrical purposes / Кабелепроводы