307. You are in the planning stages of replacing a battery charger, where an exact duplicate of the charger to be replaced is not available. Obviously the charger must be suitable for the battery to be charged. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following is a true statement concerning battery chargers?

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battery chargers incorporating grounded autotransformers must not be used and if the charging voltage exceeds 20% of the battery line voltage automatic protection against reversal current must be provided.

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