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FAQ

I need definitions of ship EquipmentMain switchboard:Distribution bus bars:Ship service generators:Main Engines:Prime mover:propulsion generators:propulsion motors:

It is assumed that this enquiry is in respect of large cargo or passenger vessels, not little pleasure boats. Main switchboard. This is the electrical switch panel to which all of the supplies from the service generators are led and from which all supplies to engineroom electrical equipment, deck machinery and the ships general electrical equipment, galley, navigation equipment, lighting, ventilation etc are supplied. The main switchboard comprises distribution bus bars, switches, meters and on AC ships, now in the the majority, the equipment required to synchronise the phases of the service generators. The distribution bus bars are the principal electrical conductors to which the generator outputs can be switched and from which the circuits to the rest of the ships electrical equipment are supplied. There are usually four bus bars, three carrying electricity at 415 or 440 volts three phase and a neutral bar. The current is usually supplied with a frequency of 50 Herz or 60 Herz. Ships service generators are in modern ships alternator units which supply all electrical requirements with the exception of the ship's propulsion. They are normally powered by diesel engines or steam turbines and in some naval vessels by gas turbines. Main engines. This term is invariably used for the vessel's propulsion machinery. Prime mover. This is a general term not restricted to marine practice for any machine the converts the energy of a fuel or the heat energy of steam into kinetic energy. Propulsion generators. These can be DC generators or AC alternators which have outputs dedicated for ship's propulsion purposes. The are usually connected independently of the main switchboard via a dedicated propulsion switchboard. Propulsion motors. These are electric motors which drive the ship's propellers. They are usually inboard but many modern cruise ships have their propulsion motors within pods which are outside of the main hull.

electrical equipments like resistor,capacitor, transistor, etc

Possibly your best bet is to take apart junked TVs and other electronic equipment. I've found about 95 percent of the components are still good as new.

I am an electrical engineering graduate with very little knowledge of business studiesHowever, I will be beginning my career as a procurement engineer in October.In your own words, what is this?and what duties might it involve?Warm regards,de Róiste BSc

You will probably be responsible for specifying electrical equipment required for purchase for various projects, for recommending various vendors to obtain bids from, for putting request for equipment bid packages together, and then for making recommendations for which vendor(s) to buy from. Seems like you should have asked your employer what your duties would be.

1.What is Rated AC voltage? Why we would like to state Rated instead of Nominal?2.What is Nominal AC voltage?3.Explain rms value for AC voltage. What is it's relation to Rated/Nominal Voltage?

It is common habit to speak of extracting current, but it is misleading, in that it implies the device is acting in a positive fashion. It is more useful to regard the appliance (whether AC or DC) as a passive load, accepting what gets fed to it. The typical device will therefore draw an excessive current when too high a voltage is supplied and too little current to function properly when the voltage supply is too low. It follows from this that the appliance does not extract a working voltage from a voltage supply that is too high (unless it has an input stage that is specially designed to achieve this).

I am a commercial real estate appraiser and I oftentimes need to be specific about the electrical service available within a building. I can read the service panel(s) and total the various amps volts, but I don't know what is relevant to report. For example, I recently inspected a very large industrial building and all of the service panels combined had a total of 30,000 amp, and I also noted that it had a 3-phase unit. Is that relevant to report that is was 30,000 amp, 3-phase service? Should I also report the voltage? Should it read: 30,000 amp/### volt 3-phase service. In the future, can I just read the service panel(s) and total the numbers? Just because a panel says 4000 amps, does that mean it actually has 4000, or that it can handle that many amps?I know that's allot of questions, but any help that I can get would be helpful. Thanks!

You would be better off to hire an electrician to get this info as there are a lot of variables. The voltages and phases available, the amps available, and the number of circuits in each one. Many panels you have to remove the cover to see the rating, and this is dangerous. A typical building may have thirty 225 amp 3 ph. lighting panels that are fed off of 60 amp circuits for 277 vac lighting. The service may only be 800 amps for the whole building. This is very common and meets NEC requirements. The largest bldg. where I work at the Univ. is 400k sq ft and has a 4000 amp service at the 480 volt level. This is the same as 145 amps at the 13.2 kv level. It all depends on whether or not you own the high voltage service also. An industrial bldg. could be much more.

Hi!Is there an NEC section which addresses the following kitchen design? I'm working with an apartment complex and they've designed each unit's breaker box to be located directly over the stove top burners. Something just sounds real bad here - but, perhaps I worry about things melting when water is brought to a boil or the oven is at 450 F for an hour or so and the vent for the oven is directly through a back burner. [The door for the breaker box just clears the top of the stove top.]Thank you!!

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can you please list me responsibilities of house wiring?for example: make sure you are safe from any electrical equipment, wear gloves.thanks

You should never work on a circuit that's live or has electricity in it. Always make sure the circuit breaker is shut off and is labeled as being worked on so somebody else doesn't turn it on. Other than that, do the work according to the electrical code in your area.

I don't know a lot about electricity, but I know that on earth we ground our outlets, computers, etc. Do they have a means of grounding electricity in space? Are electrical systems more dangerous on spacecraft?

We do not ground all electrical equipment. Much of it is double insulated. Grounding simply connects the chassis to Earth, so that if there is an electrical fault that makes the chassis live this is short to Earth and a person, who we might expect to be standing on Earth and not hovering, will hence be at the same potential as the chassis. The actual circuit is not grounded - its return path conencts to neutral. Precisely the same principle can be used in space, but in light of the fact that people in space may actually be floating, double insulation is safer.