In accordance with 46 CFR, Subchapter J (Electrical Engineering), each diesel engine driven generator prime mover must have an over speed device, independent of the normal operating governor. If in testing the over speed device, what should be the trip point setting in terms of rated speed?
Official USCG Answer & Rule Citation
Correct Answer: Option B — not to exceed 15% above rated speed
46 CFR Subchapter J requires diesel engine generator prime movers to feature an independent mechanical overspeed device set to trip at no more than 15% above the engine's rated synchronous speed.
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