SAMS Vessel Electrical Systems 2

Question 1

According to ABYC E-11, what is the maximum allowable voltage drop for a vessel's DC lighting circuit?

Accepted Answer

3%

Answer

ABYC E-11 specifies a maximum 3% voltage drop for lighting circuits on recreational vessels.

Question 2

A marine surveyor finds bare copper conductors used throughout a vessel's bilge wiring. This is a concern primarily because:

Accepted Answer

Bare copper corrodes rapidly in the marine environment and may cause high-resistance connections

Answer

Bare copper in the bilge environment oxidizes and corrodes, creating high-resistance connections that can cause overheating and fire.

Question 3

Which type of battery is most commonly recommended for dual-battery systems on recreational vessels due to its tolerance for deep discharge?

Accepted Answer

Deep-cycle battery

Answer

Deep-cycle batteries are designed to be repeatedly discharged to a significant portion of their capacity without damage, making them ideal for house banks.

Question 4

When inspecting shore power connections on a vessel, a surveyor should verify that the shore power cord receptacle is rated for:

Accepted Answer

At least 125% of the maximum load current

Answer

Shore power receptacles must be rated for at least 125% of maximum load current to prevent overheating under continuous use.

Question 5

On a vessel with a 12V DC system, a surveyor measures 0.5V drop across a battery switch under load. This indicates:

Accepted Answer

Excessive resistance likely due to a corroded or loose switch contact

Answer

A 0.5V drop across a battery switch represents significant resistance that indicates corroded or deteriorated contacts requiring replacement.

(SAMS) Society of Accredited Marine Surveyors Certified Practice Test

(SAMS) Society of Accredited Marine Surveyors Certified Practice Test

SAMS Vessel Electrical Systems 2