Which standard should be apply for mediun voltage converter

Andy.Yang

广东安规检测
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Now my company wanna have a UL certification for our medium voltage converter, brief introduction as below:
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( E) g4 |0 ^8 ^% jPower cell: input:690V/3 phases, output voltage and frequency can be adjusted.
System:6 power cells in series, and then the total output voltage can be very high.
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9 X. m5 K3 r7 X2 C: R% ^After checking the UL standards, I think UL508C and UL347A will be used, but UL508C only applies to 1500V and below, UL347A is for more than 1500V. From my side, I think UL347A is a supplement for UL508C, so I feel our products should follow UL508C first for the power cell, then for system, we can use UL347A....

7 G6 E$ W+ v' D7 V6 eAm I right, or if my friends have other advise or instruction, pls kindly instruct me.
/ c  v9 J/ S; Z- Q+ `* I
Thanks!