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定价: 541元 / 折扣价: 482 加购物车

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定价: 541元 / 折扣价: 482 加购物车

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定价: 1323

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定价: 394

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1. Scope This Standard applies to track systems with two or more poles for the connection of luminaires to the electrical supply, either of rated voltage not exceeding 300 V between poles, 150 Volts-to-ground with the provision for earthing (Class I) a

定价: 546元 / 折扣价: 465

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This International Standard provides information necessary to store data on cards, to read data from cards, and for the physical, optical, and data interchangeability of optical memory cards in information processing systems.

定价: 546元 / 折扣价: 465

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定价: 1183元 / 折扣价: 1006

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1. Scope This standard deals with the safety of electrical appliances for household and similar purposes, the rated voltage of the appliances being not more than 250 V for single-phase appliances and 480 V for other appliances. This Standard applies

定价: 2139元 / 折扣价: 1819

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1.1 Scope This part of IEC 71 constitutes an application guide and deals with the selection of insulation levels of equipment or installations for three-phase electrical systems. Its aim is to give guidance for the determination of the rated withstand

定价: 2184元 / 折扣价: 1857

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