ABYC Marine Electrical Certification Exam Review 2025 Guide, Exams of Electrical Engineering

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ABYC Marine Electrical Certification Exam Review 2025 Guide

How often (in inches) shall wire bundles be supported? - “Every 18 inches. What type of clamps are to be used for supporting wire bundles when routed over engines and machine! What tensile force must a 10 Gauge crimp connector withstand for one minute? ANSWER-A0 lbs (E-11 Table XV) What is the max allowed unsupported cable length for battery cables? - CORRECT ANSWER36 inches T or F: Running AC and DC conductors together is allowed so long as the AC conductors are sheathed. - CORRECT ANSWER-True The most common electrical circuit problem in marine applications is: A\. Short cireuils B. Too much continuity C. Unwanted open D. Inter cireuil Short - CORRECT AN. The primary by-product of oxecessive electrical resistance is: A. Increased Amperage B. Increased Voltage C. Reduced Ambient Temperature D. Heat - D. Heat What is the preferred loal for tracing shoried and open circuils? A. Ohm meter B. Amp clamp C. Volt meter D. TDR (time-domain reflectometer) - CORRE’ WER-D. TDR (time-domain reflectometer) A technician is installing a cable run from the batteries to the main DC panel board on a boat as part ofa refit. The boat has a 12-volt system and the distance form the panel to the batteries is 15 ft. The maximum current draw from the panel is calculated at 90 amps. What guage cable should be used Gninimum)? - CORRECT ANSWER-0 AWG DC grounded conductors on new boals that arc also equipped with AC sysloms should use what ANSWER-Yellow color insulated wire? - CORR What is the smallest guage wire allowed for unsheathed wire runs through the boat? - CORRECT ANSWER-16 AWG T or F: Compared 1o deep cycle (house) battorics, cranking batteries will have thicker lead plates ANSWER-False. Start to facilitate the higher, short-duration current draws. - batteries have a greater number of thinner plates within each cell. Define: Marine Cranking Amps = the discharge load, in amperes, that a new, fully-charged bat _ volts (for a 12 v battery). - C Fat degrees F can deliver for seconds while maintaining a voltage of ‘32 degrees F, 30 seconds, 7.2V. Define: Cold Cranking Amps = the discharge load, in amperes, that a new, fully-charged battery al degrees F can deliver for ___ seconds while maintaining a voltage of ____ volts (for a 12 v bal - CORRECT ANSWER-0 degrees F, 30 seconds, 7.2V What is the largest guage wire that may be connected to a bettery with wingnuts? - CORRECT ANSWER8 AWG bank with a CCA rating greater than____ (or greater than Ah if CCA rating not ~800 CCA or 100 Ahr (exceptions: electronic equipment with battery backed memories: safety equipment such as bilge pumps, alarms, CO detectors, bilge blowers; battery chargers: I’m pressed current systems. What is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a oR-AIC = 5000 Amps (E-11 table IV- A) he minimum ampere interrupting capacity (AIC) for main overcurrent protection on a LAIC = bank rated al. more than 2200 CCA or more than 500 Ahr? - ¢ 2X mntg’s short-circuit rating or 100X nominal Ahr rating. T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes that it CORRECT ANSWER-False. “Readily snicy as dangerous - use a remote must be located as close to the batt as practical. - accessible” defines entry into the engine room in an em battery switch. Explain the "7-40-72" rule - CORRECT ANSWER Overcurrent protection must be located withing 7 inches of the powe ource unless contained within a sheath, in which case it may be up to 40 inches away. If the power source is a battery and the conductors are sheathed, OC may be up to 72 inches away. What docs “trip [rce" brcaker mean? - CORRECT ANSWER-Resctting mechanism cannot overrid over current interrupting mechanism. (No idential breakers are not trip free) The maximum sustained charging voltage acceptable to some gell cell battery manufacturers is: A18V B.145V C.141V D. 13.2 VIl- CORRECT ANSWER-C. 141 V When Lesting a wel-cell ballory with a hydrometer, whal. threshold is used to determine a bad cell? - CORRECT ANSWER-0.030 points of specific gravity below ather cells = bad cell. When Losting a wel-ecll baltory with a hydrometor, whal reading indicatcs a filly charged R. Al “F2-1,260 - 1.285 (temperature dependent) battery? When testing a fully charged start battery for capacity with a load tester, what % of CCA rating should be induced by the load to test resulting voltage? - CORRECT ANSWER-50% Most engine-driven alternators are optimally spun at what percentage of engine RPMs? A. Between 10% and 30% B. Less than 10% T or F: All marine inverters shall utilize an intemal or external GFCI on their AC outle False. (only when installed in location that required GFCI] per ABYC E- T or F: most GFCI outlets can be used in a gasoline engine room - CORRECT ANSWER-False. Most are not ignition protected. T or F: Because the shore power connection is a power source, the neutral conductor should be ticd Lo ground al the point where it comes in to lhe boal. (shore pawer cable connection) - CORRECT ANSWER-False. Shore power neutral is tied to ground on the shore side. Tech A says that voltage supplied to the retor controls the alternator output voltage. Tech B says that the alternator output is proportional to the rotor voltage. Which is correct. A, B, Both or Neither? - CORRECT ANSWER Both. Tech A says that AC and DC are able to run together down the same conductor. Tech B says this Tech is technically impossible. Which is correct, A, B, neither or both? - A According to ABYC, what is the maximum distance allowed between a boat’s shore power CORRECT ANSWER-10° connection and the main overcurrent protection de What is an ELCI and where is it required to be installed? - -Equipmen. Leakage Current Interrupter - within 10 fect of shore power connection unloss an isolation transformer is located within 10’ of shore power connection. T or F: When more than one option for shore power inlet is installed on a boat, the shore power neutrals shall be tied together on the boat. - CORRECT ANSWER-False, they must be isolated to prevent shock hazard at the unutilizd shore “r connector pins. What ampacity is required for wire and terminals connecting a galvanic islolator?- CORRECT ANSWER-AL loast. 135% of isloator’s nominal rating. (A-28.11.1) { Ampacity < 20 Amps, voltage drop across terminals <50 mV @ 20 A flow, no separation with a one-minute pull of 6 Ib force. What is the general rule for use of friction connectors? When mncasuring Lomperalure to determine potential clectrical issues involving cxecssive above ambient According to the ABYC, the shore-power grounded conductor should: A. Be connected to the AC neutral B. Not be grounded on the boat C. Be connected to the engine common positive terminal or its bus D. Be tied to the battery isolator - CORRECT. Ifa customer complains about receiving shocks from her boat when shore power is act. the technican should first test: A. Polarity check of shore cord B. Polarity check of the battery system C. Current Leakage Test D. Converter voltage check - cA. Polarity check of shore cord D. Burned out 120V appliance - CORRECT. T or F: Generators that are “self-limiting” do not require overcurrent protection if the conductors used are of sufficient ampacity and sized for maximum current available. - CORRECT ANSWER True (provided the generator’s self-limiting current, AKA “overload current”, docs not execed 120% of it’s raled current oulpul) What tool is used to test the insulation integrity of a generator windings and what is the generally accepted Mimimal measurement? - CORRECT ANSWER Mega ohm meter (AKA “merger"), 1M Ohm A\cuslomer complains that her generator will start from the local control panel at the generator, but not from the remote control panel at the helm. Which of the foillowing is the most probably cause? A. Bad generator starter solenoid B. Low voltage at the starter battery C. Excessive voltage drop across the remote starter switch D. Loose battery cable clamp at the starter battery - drop across the remote starter switch On a brushless generator, a possible cause for low AC voltage output under load could be: A. High engine RPM B. Faulty exciter winding / diode rectifier circuit C. Faulty output circuit breaker D. Exe diode ively high DC voltage supply - CORRECT ANSWER. Faulty exciter winding / ier circuit Tech A says the ABYC has pull-test requirement for wiring connecting the generator to onboard circuits. Tech B says pull-test requirements are dictated by the generator manufacture. Which one is correct? A. Tech A B. Tech B C. Both Techs D. Neither Tech - { T or F: metal AC panel boards must be grounded. - C T or F: Boats that have an inverter installed must have a warning label noting such at the main electrical panel- CORRECT ANSWER-True What must be true of a sub-panel input circuit breaker's rating such that the main breaker may be sized up to 150% of the sub-pancl feeder conductor’s ampacity? - CORRECT ANSWER-The 1 « for the rip point shall be no greater than 100% of the total current dr: sub-pancl breake: entire sub-panel. What is the minimum insulation temperature rating for conductors routed inside an engine room? 75 C (167 F) -11.14.1.1.3) What is the minimum voltage rating for all DC conductors? - CORRECT ANSWER-a0 VDC (E- 11.14.1.2.1) When multiple DC conductors are bundled together for a distance of greater than____ inches, the allowable ampacity of each conductor must be derated based on the table found within standard E-11 - CORRE NSWER-24 inches (E-11.14.1.3.7.1) A. Voltage B. Capacitance C. Continuity D. Inductance - CORRECT ANSWERC. Continuity All terminations and junctions for AC conductors must be installed: A. in free air Lo allow for proper ventilation B. Inside an enclosure requiring the use of hand-tools to open C. In conduit use of hand-toals Lo open Wha is the best tool to use for locating short-circuits? A. Megger B. Amp Clamp Cc. DVM D. TDR - CORRECT ANSWER-D. TDR High frequency transformers typically run _, than traditional magnetic transformers. A. Cooler B. Hotter C. Faster D. Slower - ¢ A. Cooler What is the pull-test requirement for DC plug/receptacles? - CORRECT ANSWER-6 lbs for 1 minute (E-11.13.2.3) T or F: For AC wiring, the “hot” ungrounded conductor (Le., not the insulation color) should be brass or copper colored and the “neutral” grounded conductor should be light silver colored. - CORRECT ANSWER-Truc For a branch circuit supplying both receptacle loads and permanently connected loads. what is the maximum recommended permanent load for 15-amp circuit? For 20-amp circuit? - CORRECT Walls for 20-amp circuit (E-11.13.3.4) When calculating AC loads, what is the recommended walltage por square foot of living area? - tts / sq. ft. (E-11.8.2.2.1.1) When calculating AC loads for small galley appliances, how many watts should be used for each 20 amp circuit?- CORRECT ANSWER-1500 Watts /20 A circuit (E-11.8.2.2.1.2) T or F: when installing a remote solenoid for switching high-current draws like windlass, bow- thruster, etc, a separate appropriately sized overcurrent protection must be in place for both the ANSWER-True low-current and high-current wiring of the solenoid. - CORR! Describe the reason why a locked-rotor malor may nol Lrip an overcurrent protection device. - CORRECT ANSWER-As the motor heats up, winding resistance increases cat nga motors! For how long must a motor be able ta sustain a locked rotor condition wilhoul inducing a fire hazard? - CORRECT ANSWER-seven hours (E-11.10.1.3.1) in current draw. Fire hazard. Thermal protection device recommended in T or F: boats with an enclosed accommodation compartment shall have an audible high bilge- CORRECT. ANSWER-True water alarm. - What gauge wire is required at a minimum for the primary down conductor from a lightning Air Terminal? - R4 AWG What is the minimal required surface area for lightning protection system's immersed ground 2ORRECT ANSWER_1 sq, ft. plate? - What gauge wires is required for lightning protection system secondary conductors? - CORRECT ANSWERS AWG What is the maximum allowable trip current & time for ELCI/RCD at the main shore power input? - CORRECT ANSWER-30 mA, 100 ms or, V peak * .707 = ¥V RMS What is the max typically allowable % difference between true sinusoidal peak AC voltage and harmonically distorted peak AC voltage’ On a standard 3-conductor AC outlet, which of the two blade conductors not the rounded GROUNDING conductor) is Hot and which is Neutral?- CORRECT ANSWER-shorte terminal is HOT thicker taller, narrower terminal is NEUTRAL A polarity indicator light that is glowing more dimly than normal could be an indicator of: A. An open circuit in the neutral to ground link at an AC generator B. An open circuit in the hot wire connection C. A ground connection with very low impedance D. Excessive AC frequency - CORRECT. link at an AC generator When using a high-resolution amp clamp on a shore power cord and aclivaling AC circuits onc by one, the technician notes that the AC leakage current measured increases with each appliance. This most likely indicates: A\. An open-cirenit in Lhe grounding conductor on the dock B. Excessively high voltage delivered by the utility company C. Excessive voltage drops in the AC power supply to the boat D, A neutral-to-gound link at the boats AC panel board - { ‘R-D. A neutral-to- gound link at the boats AC pancl board A system voltmeter shall be installed on the main panel board if the system is permanently connected to: A Inverter B. Generator C. Motor Sheathed ungrounded conductors connected directly to a battery must have overcurrent protection devices located within inches of the connection to the battery. a7" b. 36" {slightly less than 1 meter) 6. 40" a. 72" d. 72" Ina series circuit, the more resistive loads you add: a. The total voltage will increase b. The total current will inercase c. The total voltage will decrease The maximum number of terminals to be attached to any one terminal stud based on ABYC Standard is: al b.2 What does “trip free” circuit breaker mean? a. The breaker is inexpensive b. The breaker will have lots of nuisance trips c. The breaker will trip out regardless of conditions d. The breaker will only trip at 150% of its rated amperage - CORRECT ANSWER-c. The breaker will trip out regardless of conditions maximum current carrying capacity for an flexible cord of 16 AWG with 2 current carrying conductors inside the engine spaces is a. 6 amps b. 8 amps c. 10 amps d. 20 amps - CORR! Cords) ANSWER. 8 amps (E-11 Table XII Conductor Ampacity - Flexible A diode is a semiconductor that passes current a. in any direction b. only with high voltages c. only in one direction d. when used as a triggering device - CORRECT Allowable amperage for AC conductors of 14 AWG, 105 degree C insulation, outside the engine spacos, whon 2 current carrying conductors are bundled together is a. 35 amps b. 24.5 amps c¢. 20.8 amps d