Ten current-carrying conductors occupy a conduit above a boiler room. Which ampacity adjustments must be resolved before conductor selection?
- Both conductor-count adjustment and ambient-temperature correction
- BOnly raceway length
- COnly the equipment-grounding conductor size for the described C-10 installation and documented operating conditions
- DOnly system voltage
Why A is correct
The best answer is: Both conductor-count adjustment and ambient-temperature correction. Bundling and elevated ambient temperature both reduce allowable ampacity under applicable conditions. Raceway length and voltage may affect other design issues but do not replace these thermal corrections. 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.