Question 191Electricity & Electronics - 1st Asst/Chief

70% to pass

Which of the following statements is true concerning the cleaning of electrical contacts?

AMagnetic brushes should be used to remove metallic dust.
BThe contact surfaces should be greased to increase contact resistance.
CCompressed air should be used to blow out metallic dust.
DDelicate parts should be cleaned with a brush and an approved safety solvent.
AI Explanation

The correct answer is D) Delicate parts should be cleaned with a brush and an approved safety solvent. This is the correct answer because the proper way to clean electrical contacts is to use a soft brush and an approved safety solvent, which will not damage the delicate parts. Magnetic brushes can cause metallic dust to adhere to the contacts, compressed air can blow the dust into other areas, and greasing the contacts will increase the contact resistance, which is undesirable. The Coast Guard regulations emphasize the importance of using the appropriate tools and materials to maintain the integrity of electrical systems, and cleaning with a brush and approved solvent is the recommended method for cleaning delicate electrical contacts.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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