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, T or F: The AC grounding conductor shall be permitted to be one size smaller than the current carrying conductors on circuits rated greater than 30 Amps. Thermal protection device recommended in motors! What tensile force must a 10 Gauge crimp connector withstand for one minute? T or F: All marine inverters shall utilize an internal or external GFCI on their AC outlets. Marine electricians who are employed aboard vessels at sea will have to qualify for a TWIC (Transportation Workers Identification Card) or STCW (Standards of Training, Certification, and Watchkeeping) rating, depending on the size of the vessel and their particular role. The sub-panel breaker's trip point shall be no greater than 100% of the total current draw for the entire sub-panel. Which is correct? With 12.6 volts, how many amps is the inverter drawing from the battery bank? Tech B says that circuit breakers used in recreational marine applications must be replaced if found defective. A light circuit uses a 12 volt battery to power a bulb which uses 2.5 amps of power. False. Tool of choice for determining an inverters level of EMI is the: A 2000 watt inverter is operating inverting at 100% effeciency. What gauge wires is required for lightning protection system secondary conductors? It also involves systems that make the vessels usable for crew, passengers and cargo. What is the general rule for use of friction connectors? Established in 1954, the American Boat & Yacht Council (ABYC) is a non-profit, member organization that develops voluntary safety standards for the design, construction, maintenance, and repair of recreational boats. What is the expected voltage when measured between Hot and Neutral for a 120 Volt AC circuit? Batteries must be secured to prevent movement of more than ______ inches in any direction when a pulling force of _____ or _____, whichever is less, is applied through the center of gravity of the battery for how long? The neutral for AC power sources shall be grounded at which point? Which of the following are likely causes? We will develop product safety standards, credentialing, education, training, and other tools to equip our members to be successful. T or F: boats with an enclosed accommodation compartment shall have an audible high bilge-water alarm. When simultaneously recharging two different types of batteries (house & start) with diode type battery isolator, where is it best to sense the voltage for charging source? B. Online learning in marine technology is mostly limited to online courses in related subjects. Describe the reason why a locked-rotor motor may not trip an overcurrent protection device. You have a cable that runs from a battery to a bow thruster. According to ABYC, what is the maximum distance allowed between a boat's shore power connection and the main overcurrent protection device? Voltage drop could be used to test for a bad starter cable. (see 11.6.2.3.2, exception). To check a voltage regulator is working properly, the best thing a technician can check: According to ABYC, maximum current carrying capacity of a 10 gauge wire, 105 degree C insulation, inside the engine room when bundled with 2 other current carrying wires would be? The boat has a 12-volt system and the distance form the panel to the batteries is 15 ft. T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes that it must be located as close to the batteries as practical. Tech A says they should use all series circuits to keep the wiring clean and simple. b. On diesels, the oil pressure sender may be used to switch alternator on/off and the trigger the tachometer. What is the minimum voltage rating for all DC conductors? c. When connected in series AmpHrs is increased. He or she may also handle emergency repairs on ships in port, in dry dock, and out at sea. Check the voltage at the dock pedestal. When can a flat washer be used on a battery terminal? In a series circuit, the more resistive loads you add: The maximum number of terminals to be attached to any one terminal stud based on ABYC Standard is: c. The breaker will trip out regardless of conditions. b. If a customer complains of low voltage at the AC Panel while at the dock, the technician should first, Technician A says overcurrent protection for the main shore power feeders must be with 7" of the source of power (the hull. Technician B says that they must be kept separate. The heater is rated at 2500 watts. Who's right? When testing a battery, the hydrometer is used to test. The BMEEA was formerly known as the British Marine Electronics Association (BMEA) until October 2013. Crafts, and Supplement SA, Marine Power Converters/Inverters and Power Converter/Inverter Systems, need not meet UL 1236 as referenced in ABYC A-20, Battery Charging Devices. You're installing a 500 GPH bilge pump to be used as a shower pump (just to drain the shower grey-water). 8 amps (E-11 Table XII Conductor Ampacity - Flexible Cords), maximum current carrying capacity for an flexible cord of 16 AWG with 2 current carrying conductors inside the engine spaces is, A diode is a semiconductor that passes current, Allowable amperage for AC conductors of 14 AWG, 105 degree C insulation, outside the engine spaces, when 2 current carrying. Tech B says that such panel boards should be grounded to the AC grounding bus. While out cruising (away from the dock), batteries on a typical cruiser have what percentage of charge? d. When installed immediately under a split lock washer and nut. The total impedance of polarity indicating and protection devices connected between normal current carrying conductors and the grounding conductor (green wire) shall be: T or F: An acceptable way to check for loss of ground in an AC circuit is to plug a light bulb into a receptacle's hot and ground. The Electro Technical Officer or Electrical Officer is a licensed member of the engine department of a merchant ship as per STCW section A-III/6 of the STCW Code and is the most vital in the technical hierarchy of modern advanced ships with automated and conventional electrical and electronic systems. How much current should flow through the DC grounding conductor in a 25 amp DC motor circuit. Equipment Leakage Current Interrupter - within 10 feet of shore power connection unless an isolation transformer is located within 10' of shore power connection. What wire is best suited for bonding under-water components: False. Technician A says that a generator's neutral and ground must be connected together at the generator. All of the following are likely causes, except: What is a likely cause of non-functioning galvanic isolator? Which tech is correct? In case of an internal short to the case, the AC grounding wire would not carry enough current. b. T or F: magnetic transformers with integrated secondary-side overcurrent protection and automatically resetting thermal overload protection are ABYC compliant. What material is recommended for clamping conductors over engines and moving machinery according to ABYC. When completing a job after a partial rewiring of a customer's boat, the technician should: Using the circular mills formula, what size wire would you need for a green, 96 watt running light that is 16' away from the distribution panel in a 24 volt vessel. What should you do first? What guage cable should be used (minimum)? Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in the electrolyte. What size circuit breaker would you use? T or F: most GFCI outlets can be used in a gasoline engine room. 16 ga. (see E-11.14.1.1.2 note: some 18 AWG exceptions exist), For AC circuits, ABYC recommends that minimum conductor size shall be at least. No smaller than 1 size below the DC current carrying conductors between the charger and batteries - provided OC protection on positive DC output is no greater than 135% of DC grounding cable ampacity and conductor is no smaller than 16 AWG. Both technicians agree that batteries have to be accessible for inspection and maintenance according to the NFPA. How many amps will it draw? If installed in a head, galley, machinery space, or on a weather deck, a receptacle shall be protected by. Why might a fully-discharged wet-cell type battery freeze? 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