A cold-weather rooftop PV string is being designed. Which calculation establishes whether maximum DC voltage stays within equipment ratings?
- The temperature-corrected series-circuit open-circuit voltage
- BThe inverter enclosure color
- CThe monthly utility bill
- DThe AC panel directory length for the described C-10 installation and documented operating conditions
Why A is correct
The best answer is: The temperature-corrected series-circuit open-circuit voltage. PV maximum voltage is derived from source-circuit open-circuit voltage with the applicable temperature correction. Utility consumption and physical appearance do not determine the maximum DC voltage. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.