IS 13947 Pt.4/Sec.1-1993

标准号：IS 13947 Pt.4/Sec.1-1993
发布日期：1993/6/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：This standard applies to the types of equipment listed in Sub-clauses 1.1.1 and 1.1.2 hereinafter whose main contacts are intended to be connected to circuits the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.Starters and/or contactors dealt with in this standard are not normally designed to interrupt short-circuit currents. Therefore, suit-able short-circuit protection (see Sub-clause 8.3.4) shall form part of the installation but not necessarily of the contactor or the starter.In this context, this standard gives requirements for:contactors associated with overload and/or short-circuit protective devices;starters associated with separate short-circuit protective devices and/or with separate short-circuit and integrated overload protective devices;contactors or starters combined, under specified conditions, with their own short-circuit protective devices. Such combinations, e.g. combination starters (see Sub-clause 2.2.7) or protected starters (see Sub-clause 2.2.8) are rated as units.Circuit-breakers and fuse-combination units used as short-circuit protective devices in combination starters and in protected starters shall comply with the requirements of IEC Publications 947-2 and 947-3, as the case may be.Equipment covered by this standard is as follows:1.1.1