1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 347A Medium Voltage Power Conversion Equipment STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MAT
2、ERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Medium Voltage Power Conversion Equipment, UL 347A First Edition, Dated September 8, 2015 Summary of Topics Revision pages have been issued for the Standard for Safety for Medium Volta
3、ge Power Conversion Equipment, UL 347A, to incorporate the following: Editorial Correction to Table 19.1 Addition of Section 19.6 Covering Circuits Provided with Solid Insulation Replacing References to UL 347B with References to UL 347 Clarication of Short Circuit Test Requirements for Bypass Circu
4、its Addition of Series Connected Component Spacings for 600 V and Below Clarication of Scope to Reference UL 347 for Solid State Reduced Voltage Starters Capacitor Discharge Test in UL 347A Clarication of Clause 14.1 - Interlocking Requirments Editorial Revision to Clause 15.1 Revision to Clause 15.
5、4 Editorial Revision to Clause 19.3.2.1 Revision to Clauses 19.4.1 however, temporary conductivity is expected when equipment is out of operation. 2.30 POLLUTION DEGREE 3 Conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation that is expected.
6、 2.31 PRIMARY CIRCUIT A circuit in which the wiring and components are conductively connected to the branch circuit. 2.32 PRIMARY SECTION (of a voltage divider) That portion of a voltage divider where a large fraction of the input voltage is present during normal operation. 2.33 PROTECTION, OVERLOAD
7、 A protective device or circuit that detects excessive current, (not necessarily short-circuit current) and functions to cause interruption or limitation of the ow of current through the protected device or circuit. 2.34 PROTECTION, OVERVOLTAGE A protective device or circuit that detects excessive v
8、oltage and functions to interrupt power or reduce voltage to the protected device or circuit. 2.35 RATING A designated limit of operating characteristics based on denite conditions. Operating characteristics such as current, voltage, frequency, and other characteristics comprise the rating. SEPTEMBER 8, 2015 MEDIUM VOLTAGE POWER CONVERSION EQUIPMENT - UL 347A 8
