Electrical Wiring

a speaker is a device for sending out sound.

a woofer is a speaker designed for low bass sound

a tweeter is a speaker designed for high treble sound

A ladder diagram will systematically show how a piece of equipment is wired and how the electrical circuits combine to make the equipment operate successfully.

It is usually drawn with the line control voltage on the left side of the page and the control neutral line on the right side of the page. Electric symbols representing actual devices are drawn in between these two lines. These circuits are like rungs in a ladder. For every control panel that is built there should be a ladder diagram. It is these ladder diagrams that electricians use to trouble shoot electrical control equipment. Without these diagrams it is nearly impossible to fine a fault in control circuitry.

H1 is a terminal designation on the primary side of a transformer. The counter part to this terminal is H2. These two terminals are the connection points for the primary coil of the transformer.

Heinrich Hertz discovered this in the late 19th century when he demonstrated that electromagnetic waves could travel through space without the need for a wired conductor, through his experiments with radio waves. This discovery laid the foundation for wireless communication technologies.

(30000/min)(1min/60sec)=(500/sec)=500 Hertz

Actually, a data cable tray is a low voltage cable tray also. Data systems are accepted as low voltage systems. Ordinary two data cables do not form any magnetic disturbance to each other. So for an ordinary situation no vertical or horizantal distance required.

Linemen work on live wires by using proper insulation gear, and by making sure that there is never any path for current to flow in case the insulation does fail. In some cases, the lineman can be raised to the potential of the line, but you still need the insulation, and you still need the technique of ensuring that no circuit can be accidentally created.

V X A = W .....from.. (P=IV)

W = power

V x A = apparent power

Yes it would work pretty well but it might not meet its accuracy specification.

The six wire motor is probably a two speed or a dual voltage motor. Look on the underside of the motor's junction box. Here is where the wiring diagram of the motor is pasted. Look on the motor's name plate to see if it is a two speed motor. There will be two sets of amps and RPM and maybe voltages.

It could be that six terminals are brought out to terminal box so that it can be connected either in delta or star configuration. As stated above the name plate details would indicate the correct connection.

Yes, ground fault protection for equipment is requiredeven if the neutral will not be used.

However, the question implies that it might not be required if there is a neutral. That is not true. With two exceptions, ground fault protection is always required in the US, and it is probably required in other countries as well.

The exceptions are the use of an electric cooking range, and an electric clothes dryer. In those cases, the US NEC allows the neutral conductor to also be the ground fault conductor, except for the case where the range or dryer is in a mobile home. In the case of the mobile home, the ground fault conductor and the neutral conductor must be maintained separate and distinct all the way back to the distribution panel.

In every other case, including where local code overrides the US NEC's exceptions, it must be understood that ground fault protection (protective earth ground) is not the same as neutral, even though the neutral conductor is grounded.

In control circuit wiring the safety switch is in series with the holding coil.

This is a very technical electrical question that may be difficult to understand without further study. But adding appliances to an outlet is the same as adding resistance in parallel. Adding resistance in parallel, the resistance of the circuit goes down. That is why you get more current flow.

By contrast, adding resistance in series increases the resistance of the circuit and therefore reduces current, all else being equal.

Yes, but the motor's horsepower rating will not be reached.

4 Ohm subs wired in series gives an impedance of 8 Ohms. 2 4 Ohm subs wired in series, wired with an 8 Ohm sub in parallel gives you a final impedance of 4 Ohms. Speakers wired in series raise impedance, speakers wired in parallel lower impedance.

Efficiency of any electrical machine is maximum when the load on that machine is such that the variable loss ( copper loss) is equal to constant loss (eddy current loss, hysteresis etc).the same applies to dc machines too.

Line current = 10MW / 500kV = 20A

Assuming the 1000 ohms is the resistance of the entire transmission line, end to end.

Power loss = line current ^ 2 * line resistance = 20A ^ 2 * 1000 ohms = 400 KW

When Corona Discharge occurs it forms ozone and nitrogen oxides. These combined with moisture to prduce nitric acid, which is destructive to most dielectrics and certain metallic compositions, resulting in corrosion. In addition, the high energy in some discharges results in mechanical, electrical, and thermal damage. SC

Yes, you should be able to employ a buck boost Xformer to boost your 208V to the motors specified 240 V. Make certain when your buy or order the Xformer that it has taps to supply 240V specifically. Most will in that voltage range. The next important thing is that the new Xformer must be capable of supplying the full horsepower required by the motor. Transformer output capacity is measured in VA or volt-amps. In all praticality, this means watts. To get the number of volt-amps or watts your motor needs, multiply the number of horsepower of the motor times 746. ( 1 Horsepower = 746 Watts) example: a 3/4 hp. motor would need 3/4 or .75 X 746 W or 559.5Watts or volt-amps.Therefore a standard 500VA or .5KVA transformer wouldn't have quite enough output and you'd have to go to the next standard size 750VA. But the bottom line here is cost. Buck Boost Xformers are expensive. Figure out what the correct size of transformer you need to run your motor. Then price it out. Then price out a new 208volt motor of the same hp. rating as the one you have. If the motor is cheaper, well then there you go, just buy a new motor. Unless the BB Xformer is a lot less than a new motor, I'd advise buying a new motor and then you have a NEW motor instead of an old motor with a transformer and the hassle of wiring it up. ( For the record, the difference between the pure value of volt-amps and watts or power is that in alternating current, the CEMF, (counter electromotive force) creates a small power or wattage loss because of increased resisatnce. This is insignificant to smaller motors, i.e., less than 10 h.p.)

If you get 220 volts instead of 208 volts it means that the transformer supplying the circuit is wired in Delta with one of the legs center-tapped to ground.

If you are describing a circuit breaker then its electromagnetic trip component will operate in the event of a line*-to-ground (*not 'phase'!) short circuit. The thermal overload component will only operate in the event of a sustained overload.

Yes a shunt trip breaker can be activated manually.

For a 3 phase motor, the voltage is 415.

Being an inductive load the power factor is commonly .85

The constant for 3 phase circuit is 1.732

You need to run the motor on no load and you use clamp meter to take the no load current. In considering the fact that on no load the measured current should not be more than 0.5 of the rated.

Assuming , under normal condition the no load current is 10 amps. Then the load current will be 20 amps.

Then from above and in using the formula P=I*V*p.f*1.732

Therefore P= 20*415*0.85*1.732.

P=12.3 kw

Thank you.

Bankole

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