Electrical Wiring

Yes, because you will be able to maintain current flow between phases.

the have large capacitance value, power rating is high , and its constriction.

To smooth power supply ripples.The output of a sinewave with the bottom waves cut off is a power supply without smoothing.You would get a hum in an amplifier if it wasn't smoothed by a large capacitance,say 400 Microfarads.On a 12volt supply as in a portable tv,the power supply smoother is around 2000 microfarads.The output waveform should be nearly a straight horizontal line with no ripples on it.

They are a really heavy duty switch and are used because they can handle high current(amps) caused especially while the motor gets up to full speed, and can handle repeated starting and stopping of the motor several times an hour if needed without wearing out, overheating or causing overload problems. Also called a contactor, it uses an electromagnetic coil that works on a lower voltage, usually whatever the control panel voltage is (24vac is most common in USA, when you push the start button it energizes the coil that slams a set of three contacts(six all together for three phase)together very tightly to complete the power circuit to the motor. The contacts inside the contactor used to be pure silver, now they are mostly copper with a thick pure silver coating on the contact surfaces.

A: CONTINUITY check is not used to ascertain ohms value but rather the connections

Typical car stereos run speakers at 4 to 8 ohms, so I would wire the two 16 ohm speakers in parallel to get a net 8 ohms. Anything over that would be a little much for a car stereo. You don't need to drive it that hard.

Armored electrical cable contains insulated electrical service wires protected by a flexible steel covering. Metallic Conduit is a tube or pipe though which we lay electrical cable.(Most commonly lighting cables).

This is an interesting question with unfortunately not quite enough information for a good answer. But I'll give you a few things that could cause this situation and the conditions in which they will occur.

1. This problem has always occurred: The wiring/circuit breaker that controls the unit are not rated high enough to accommodate the unit. Make sure that both are rated for the draw listed on a tag somewhere on the unit.

2. This is a recent problem that is getting worse with time: The wiring going to the unit degrades with time, as does the circuit breaker itself, limiting their ability to carry current to the unit causing it to try and draw more amperes than the breaker will allow. Replace the wiring and/or breaker with the appropriate size needed for your application.

3. This happens at times when there are a large amount of electrical items on in your dwelling. This means that the circuit may be being used to power other devices as well, and combined they are overloading the breaker. This is unlikely as the unit should have a dedicated circuit. Remove all other devices from the circuit, or run a new circuit to the unit of the appropriate rating.

4. This is a recent problem and is consistent in the time it takes for the breaker to trip. The wiring may have been damaged in some way, such as a mouse chewing on the wire, or a nail/screw being driven through it. This is the most dangerous of the options as it could cause a fire when you reset the breaker. Check the wiring for damage, and replace it with the appropriate size for your application.

I highly recommend that you seek out an electrician to rectify this problem. Not a Handyman, or someone of that nature, but a true licensed Electrician. This could be a serious problem that puts you, your home, and your family in danger.

Calculate the ampereage at .8 pf and take a breaker of 150% of ampere nd set the over current protection at 125% of full load current.

Phase monitors are used to detect single phasing, or loss of one phase of power from a three phase system. Most of the time they are used on very expensive motors such as high horsepower. They will shut down the starter, therefore shutting down the motor if all three phases are not available. One cause of this would be if there are three separate fuses protecting the motor and only one of them blows. The reason they are needed is because if you only send two phases to a three phase motor, it has a good chance of burning out the motor.

If the load requires a single circuit breaker, as most three phase loads do, you need a separate neutral for each. This allows you to check the balance between each phase and the other phases as well as neutral, in order to detect a ground fault.

It depends on the purpose of the three phase circuits - if this were CT cables, then yes, unless you intentionally over sized the ground wire. Otherwise this would cause unusually high voltage rise in the secondary of the CT during ground faults, which could lead to saturation (unless CT ratio is intentionally set high). As noted above, having separate neutrals helps to determine balance, although you can measure 3I0 from the phase currents for a similar relationship without actually looking at the neutral at all (some relays doe this for ground protection instead of directly measuring neutral current, see SEL's 351 for an example relay). No matter what, this would be highly irregular, and I wouldn't recommend scrimping on a neutral. In my experience, the more you move away from accepted practices (not to dampen ingenuity...), the more trouble you create for the future.

If the loads were strictly three phase then there would not be any neutral needed. If from a three phase distribution panel the loads were three single phase loads then you can use one neutral for the three phase wires. This is a code rule that has to be adhered to. A same N, B same N, C same N and only in this combination. Conduit fill 4 wires, two three phase four wire circuits, conduit fill 8 wires.

It is called a plasma discharge. It happens when a high voltage, pole top, air switch is opened under load and the current does not immediately stop but conducts through the air as the switch pole faces become further apart. Eventually the resistance of the air-gap overcomes the current flow and the plasma discharge extinguishes itself. These flash overs are hard on the contact points on the switch so long rods (called horns) are placed on the switch contacts so that as the contacts separate, the plasma discharge is drawn away from the contact and up the rods (horns) until the flash over stops. These types of switches are called horn gap switches.

Approx. 280 VRMS. Vpeak * 0.707 = Vrms

there are many different types

It is used by utility linemen for isolation purposes. If a power line needs repair it is done de-energized. By isolating the damaged section with the isolation switches the rest of the utility customers can remain on the grid (energized) and not have to be without power until the damaged section of line gets repaired.

The cable size is : 4*25 mm2

definition:Lightning is a flash of bright light in the sky which is produced by electricity moving between clouds or from clouds to the ground.

so as we know already lightning is of two types direct and indirect lightning.

These are anyway a discharge of electricity either positive or negative potential just discharges to ground known as lightning.

definition:to put an earth wire between a piece of electrical equipment and the ground.

Where as earthing is manually or artificially done to discharge any potential either to prevent any over voltages such as lightning or fault currents etc.,

yes . A change of motor would be required. The motor windings would have to be totally different. three hot leads instead of two. And three phase would have to come from your provider.

This motor will consume about 11 Kw of power when it is running. However, motors draw a very large current on startup, so an 11 Kw UPS will not be sufficient. You will most likely need a 20 Kw or larger UPS. Check with the UPS manufacturer, not all UPS's are rated for motor starting. In addition, how long do you want to sustain operation in the event of power loss? If it is more than 15 minutes or so, your batteries will become so large as to be impractical, unless your application is a critical industrial process and you have the funds to burn. Consider a UPS with batteries sized for just a few minutes coupled with a 20-25 Kw autostart generator to feed the UPS if your backup time is more than an hour or so.

P = iv

A: Any transistor of either polarity can be used as an emitter follower, The purpose of an emitter follower is to provide current to the load since it cannot provide any voltage gain

To distribute power over that many buildings, depending of the spacing of the buildings, a primary line distribution should be used. At regular intervals a step down transformer will be connected to the primary line to bring the voltage potential down to a usable voltage as required by the buildings. One transformer may be able to do more than one building depending on what each building's calculated connected load is rated at.

you need the current of motor or the KW/HP rating

Yes PVC glue is safe for electronics because it is not a conductor and it bonds electronic components.