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Mine Safety and Health Administration
Fuses That Provide Protection in Compliance With
75.1910 (a), (b), (c), (d), (e), and (f)



Nuisance Tripping Trouble Shooting Guide

Following is a list of items that have been shown to cause nuisance tripping of starter circuit fuses and circuit breakers:

Six cylinder and large four cylinder engines are prone to nuisance tripping during starting when using a single battery less than 1300CCA. Smaller capacity batteries have demonstrated an inadequate ability to initialize a rapid rotation. As a result, the inrush current is maintained for a longer period of time causing the circuit breaker or fuse to interrupt the circuit.

Low Batteries; keep the battery fully charged to maintain as high a voltage as possible at the battery terminals. The reduced voltage resulting from a partially discharged battery can cause nuisance trips.

Long Battery cables; keep the battery cables as short as practical.

Corroded battery terminals; keep battery terminals clean and in good condition.

Parasitic loads; reduce or eliminate parasitic loads on the engine that can cause a higher current draw during start up. Hydraulic pumps, torque converters, electrical devices, etc. can put a load on the engine that will require the starter to work harder and possibly cause nuisance trips.

Using after market starters; use only high quality OEM starters or high quality re-built starters. Partially rebuilt starters and some after-market starters have a higher current draw than the original equipment manufacturer's starters.

Leaving the lights on while parked; one improvement is to install the equipment lights on a solenoid circuit that de-energizes the lights when the engine is shut down.

24-volt starting systems are more forgiving than 12-volt systems because of less voltage drop in the battery cables.

Using a single battery system on the Cummins engine is very prone to nuisance tripping. A system using two batteries yields the best performance.

When all the above have failed to solve the problem, the next highest fuse or circuit breaker may be used as permitted by the 68 NEC. Under this method the next highest fuse or circuit breaker may only be used if the MSHA recommended size battery in CCA is used. .