If the cooling water system is isolated for repairs, but it is still desirable to run the alternator pictured in figure "A" of the illustration, what must be done? Illustration EL-0037

Correct Answer: Option B — The emergency air inlet panel and air outlet doors must be opened and only then can the alternator be run, but at reduced load.

When raw water cooling is lost, enclosed marine alternators rely on ambient air circulation. Opening emergency air inlet and outlet doors permits operation strictly at derated capacity to prevent catastrophic stator insulation failure from overheating, complying with IEEE 45 thermal management guidelines.