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NOTES: 1. It is intended that the protection provided be generally equivalent to that of wiring permitted by this standard wherein a definite short or break would be necessary to produce an open spark. Devices that are "explosion proof" are considered to be ignition protected when installed with the appropriate fittings to maintain their "explosion proof" integrity.

Devices that are "intrinsically safe" are considered to be ignition protected. Overcurrent protection device - A device, such as a fuse or circuit breaker, designed to interrupt the circuit when the current flow exceeds a predetermined value.

Polarized system AC- A system in which the grounded and ungrounded conductors are connected in the same relation to terminals or leads on devices in the circuit. Polarized system DC- A system in which the grounded negative and ungrounded positive conductors are connected in the same relation to terminals or leads on devices in the circuit. Motori , Elettrici. The author, Stan Honey, is a renowned sailor, navigator and electrical engineer.

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Rights , Reserved , All rights reserved. Example: quiz answers. Thank you for your participation! Open compartments having at least 15 square inches mm 2 of open area per cubic foot 0.

This cable and its terminations shall be in addition to, and independent of, any other electrical connections to the engines including those required in E NOTE: A paralleling switch may be either of the maintained contact or momentary contact type.

See Figure 18 On boats with outboard motors, the load return lines shall be connected to the battery negative terminal or its bus, unless specific provision is made by the outboard motor manufacturer for connection to the engine negative terminal.

This connection shall be used only as a means of maintaining the negative side of the circuit at ground potential and is not to carry current under normal operating conditions. The neutral for AC power sources shall be grounded only at the following points: The inverter output neutral shall be disconnected from ground when the inverter is operating in the charger or the feed-through mode s.

Each shore power inlet, generator, or inverter is considered a separate source of power. Access to energized parts of the electrical system shall require the use of hand tools. An electrical enclosure shall not be used for any other purpose. Table I is calculated using Peukert s equation. For banks constructed of multiple paralleled batteries divide the amperage requirement by the number of batteries. Reserve minutes apply to each individual battery in the bank.

EXCEPTION: Trolling motor conductors connected to dedicated trolling motor batteries provided with overcurrent protection at the battery and a manual means of electrical disconnect separate from the trolling motor controls. Electronic equipment with continuously powered memory; b. Safety equipment such as bilge pumps, alarms, CO detectors and bilge blowers; c. Battery charging equipment. The minimum continuous rating of a battery switch shall be the total of the ampacities of the main overcurrent protection devices connected to the battery switch, or the ampacity of the feeder cable to the switch, whichever is less.

On non-metallic boats using an isolation transformer or a galvanic isolator the power inlet shall be insulated from metallic components connected to the boat's ground. The shore connection end of this cable shall be fitted with a locking and grounding type plug with the required number of poles and shall comply with Article of the National Electrical Code.

Failure to follow these instructions may result in injury or death. Item 3 is not required if a polarity indicator is not installed. See E Items 2 and 4 are not required for permanently connected shore power cables. Reverse polarity indicating devices respond to the reversal of an ungrounded conductor and the grounded white conductor only when there is continuity of the grounding green conductor to shore.

Reverse polarity indicating devices might not respond to reversals of an ungrounded conductor and the grounding green conductor, the grounded white conductor and the grounding green conductor, or three-phase conductors. The rating of these overcurrent protection devices shall not exceed percent of the generator rated output. EXCEPTION: Self limiting generators, whose maximum overload current does not exceed percent of its rated current output, do not require additional external overcurrent protection.

An isolation transformer system, or a galvanic isolator in the grounding conductor, may be used to reduce this problem.

It shall be designed to withstand, without breakdown, a high potential test of volts AC, 60 Hz, for one minute, applied between the shield and all other components such as windings, core, and outside enclosure. NOTE: Breakdown is considered to have occurred when the current which flows as a result of the application of the test voltage rapidly increases in an uncontrolled manner.

Additionally this information may be used to size the alternator, or other charging means, and the battery. NOTE: Calculations are based on the actual operating amperage for each load, and not on the rating of the circuit breaker or fuse protecting that branch circuit.

The total power required shall be supplied by one of the following means: All sources need not be of equal capacity, but each power inlet shall be clearly marked to indicate voltage, ampacity, phase if a three phase system is incorporated , and the load or selector switch that it serves.

X System Voltage Shore power cable s plus on-board generator s and inverter s capacity shall be at least as large as the total electrical load requirements calculated as per E Generator s and inverters s installation and switching shall be as required in E If a shore power system is to operate on volts, use Leg A only.

Add amperes for free standing range as distinguished from separate oven and cooking units. If the total for Legs A and B are unequal, use the larger value to determine the total power required Cranking motor conductors. If the conductor is connected directly to the battery terminal and is contained throughout its entire distance in a sheath or enclosure such as a conduit, junction box, control box or enclosed panel, the overcurrent protection shall be placed as close as practicable to the battery, but not to exceed 72 inches 1.

If the conductor is connected to a source of power other than a battery terminal and is contained throughout its entire distance in a sheath or enclosure such as a conduit, junction box, control box or enclosed panel, the overcurrent protection shall be placed as close as practicable to the point of connection to the source of power, but not to exceed 40 inches 1.

Overcurrent protection is not required in conductors from self-limiting alternators with integral regulators if the conductor is less than 40 inches 1. Pigtails less than 7 inches mm in length are exempt from overcurrent protection requirements. The protection provided shall preclude a fire hazard if the circuit, as installed, is energized for seven hours under any conditions of overload, including locked rotor.

It may be necessary to use thermally responsive protection devices on the equipment or system if the motor is not capable of operating continuously at maximum possible loading. It may be necessary to test as installed in order to assure compliance with the locked rotor requirement. Voltage drop, due to wire size, and delay characteristics of the overcurrent protection device may have to be adjusted to protect the motor.

EXCEPTION: The trip-free circuit breaker or fuse at the source of power may be rated at up to percent of the conductor ampacity if there is a sub-main circuit breaker or fuse in the panelboard or switchboard that is rated at no more than percent of the load capacity, or the feeder ampacity, whichever is less. If internal explosion tests are required, the ignition of the test gas shall be created at four times the current rating of the device being tested.

Consult the circuit breaker manufacturer to determine the fuse size and the type of fuse. Fuses If internal explosion tests are required, the ignition of the test gas shall be created at four times the rating of the fuse. Unified requirements for systems with voltages above 1 kv up to 15 kv. Display Panel. Evaluating Water-Damaged Electrical Equipment. What are the basic electrical safety issues and remedies in solar photovoltaic installations? PV modules are current-limiting. Electrical Grounding.

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Connect the meter or instrument. Turn the power on. Read the values. Turn it off. Disconnect the instruments. Never work with wet hands or while standing on a wet surface.

Do not use power tools that have frayed, cracked or melted cords. Use good quality industrial grade cords of at least 20 amp rating. Do not use household two wire extension cords.

They do not have a third green grounding wire so you are not protected from shock if you accidentally contact a live circuit. Buy good quality tools. Why pay more? Quality tools are almost always guaranteed by the manufacturer.

They perform better, last longer, and rarely break, and some will be replaced free if they do break. Cheap tools will break and can injure you when they do. Again, it's all about safety. This is just as true of electrical tools as it is of wrenches, hand tools and power tools. If possible, buy hand tools that have insulated handles. For instance, adjustable wrenches, screwdrivers and pliers.

They should be insulated so you do not accidentally contact a live circuit and ground at the same time causing a short and a shower of sparks. Electrical tools, such as drills and soldering guns should be double insulated. This prevents you from being shorted to ground and getting a nasty shock. If possible use cordless, battery operated tools. They are safer than AC powered tools around the water.

Use Eye Protection: A good set of safety goggles is essential. Always wear eye protection when working with lead acid batteries or other caustic liquids such as gasoline. Also wear gloves. Acid leaves nasty burns. Most DIYers don't have an eyewash station so make sure you have lots of water available. If you do get acid in your eye, have enough water handy that you can flush out your eyes for at least fifteen minutes.

This can happen! It has happened to me. See a doctor immediately after flushing out your eyes. Chapter 2: Important Facts About Electricity. Always select good quality materials. Wire, connectors, terminals, bus bars and panels should all be good quality marine equipment. This is no place to scrimp or try to save a few pennies. Remember, the most common fires on boats are electrical fires. Most are due to bad high resistance connections.

Do it right! Have a plan. Know what you are going to do before you start installing things. See Electrical Planning. Use good quality tools. A cheap crimping tool will give you a bad crimp that will loosen and allow moisture into your connections. This will cause corrosion and high resistance connections. Buy a good ratcheting type crimper.

This will give you good crimps that don't come loose. If you decide to solder, use good quality solder and soldering tools. Learn how to solder so you don't get cold solders. A bad solder is going to cause a bad connection. Do not use solder alone. If you crimp and solder, crimp first, solder second. Seal electrical connections with a good quality sealant such as dielectric grease and a heat shrink wrap to keep moisture out. If possible buy connectors with heat shrink insulation pre-installed.

Use the correct size connector for the wire and use the correct size crimp on the crimping tool for the connector. This is very important. Otherwise you will get a loose crimp and the wire will eventually work free or break. Use good quality terminals that do not use wing nuts to connect the wire to your battery. How to use this search tool Download PDF. If you would like to be notified when new records are added to the Standards Incorporated by Reference SIBR Database, please click on the button to subscribe to this weekly alert.

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