Which FPB category applies to a system operating at 350 V?

Which FPB category applies to a system operating at 350 V?

• A. FPB 30 - 700 V
• B. FPB 700-5,000 V
• C. FPB 5,000 V or greater
• D. FPB Not specified

Answer: (A)

FPB categories are defined by operating voltage ranges. The ranges are 30 to 700 V, 700 to 5,000 V, and 5,000 V or greater, with the bounds inclusive. A system at 350 V falls within the 30–700 V range, so it is classified in that FPB category. This grouping guides the specific safety protections and procedures required for that voltage level. If the voltage were higher than 700 V, the next category would apply; if it were below 30 V, it would fall outside these FPB ranges.

FPB categories are defined by operating voltage ranges. The ranges are 30 to 700 V, 700 to 5,000 V, and 5,000 V or greater, with the bounds inclusive. A system at 350 V falls within the 30–700 V range, so it is classified in that FPB category. This grouping guides the specific safety protections and procedures required for that voltage level. If the voltage were higher than 700 V, the next category would apply; if it were below 30 V, it would fall outside these FPB ranges.