定价： 683元 / 折扣价： 581 元

This PDF includes Update No. 2 and Update No. 3 1. Scope 1.1 This Standard applies to devices that automatically reduce the initial pressure to a set lower pressure in water systems and are self-acting spring-operated devices. It applies to devices

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1. SCOPE 1.1 This Standard applies to tubular rigid metallic support members and associated fittings intended for the support and connection of supply service wires for installations operating at potentials of 750 volts or less in accord?ance with the ru

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1. Scope 1.1 This Standard is concerned with the performance, durability, and safety of packaged solar domestic hot water systems (SDHWS) designed for use in small buildings. It may be used to evaluate solar domestic hot water systems that are base

定价： 455元 / 折扣价： 387 元

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Update No. 1 was published as notification that this is now a National Standard of Canada This PDF includes Update No. 1 Preface This is the fourth edition of CSA C191, Performance of electric storage tank water heaters for domestic hot water ser

定价： 683元 / 折扣价： 581 元

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