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Electrical Wiring

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3 phase panel double pole single throw breaker 2 wires from breaker going to lighted sign 120 volts each is this a 240 volt system or a 120 feeding 2 diff ballast in the sign?

In a three phase panel a double pole single throw breaker is definatly putting out 220v as two separate 110v circuits that are out of phase with each other. So from one leg to the other its 220v and from either leg to ground its 110v.

By definition it is 220v but it could be used as separate 110v circuits as well. The only way to know how its actually being used would be to open up the sign and see if both circuits are tied into one ballast as 220v or if they split and go to differant ballasts then they are 110v circuits using a common disconnect means.

Being that either way both circuits terminate in the same area they technically both require a double pole single throw breaker.

A fan running at 1250 rpm and one running at 1750 rpm what giving delivering more cfm's?

1. ASSUMING AIR DENSITY AND FAN BLADE DIAMETER IS CONSTANT OR THE SAME --THE LATTER (1750 RPM) DELIVERS MORE CFM WHETHER BELT DRIVEN OR DIRECT COUPLED -- SAME HP RATING OF MOTOR. 2. 1250 RPM FAN CAN MATCH THE CFM OF 1750 RPM FAN --- CHANGE OR ADJUST THE PITCH OF 1250 RPM FAN BLADE. 3. 1250 RPM FAN CAN DELIVER MORE CFM THAN THE 1750 RPM FAN --- REPLACE FAN BLADE. 4. 1250 RPM FAN CAN DELIVER MORE CFM THAN THE 1750 RPM FAN --- REPLACE WITH BIGGER HORSE POWER.

What is the difference between line voltage and phase voltage?

The three 'hot' conductors supplying electricity to a three-phase load are called LINES, not 'phases' (although unfortunately the term 'phase' is widely, but incorrectly, used in the field).

Phases exist between line and neutral in star, or wye, connected systems, and between lines in a delta, or mesh, connected system. Accordingly, the term 'phase to phase' is quite meaningless.

A line voltage, therefore, exists between any two lines.

For a star (wye) connected system, a phase voltage exists between any line and the neutral conductor. For a delta (mesh) system, a phase voltage is exactly the same as a line voltage.

Components used to protect a LED?

The component used to protect a LED from burning up is called a resistor.

How do you program generic gate remotes?

Generic gate controls have an array of numbered switches that can be set in a certain pattern (e.g., 1 up, 2 down, 3 up, 4 up, 5 up, 6 down) to program them.

The typical steps to follow when programming a generic gate control are:

1. Open an already programmed gate control by removing the screws

2. Open the unprogrammed gate control by removing the screws

3. Compare the switches inside both gate controls

4. Set the switches in the unprogrammed gate control to match those in the programmed gate control

5. Cover both gate controls and fasten their screws

Why are analog waveforms sampled 8000 per second?

That is what that piece of equipment samples at. Others can sample at billions of samples per sec. It all depends on the A/D sample rate that was picked.

How is the resistor behaved at high frequency?

The major problem with resistors at high frequencies is for wire-wound (power) resistors, that will act as inductors at high frequencies. In addition, very small resistors, like chip resistors, can also exhibit capacitive effects. Special high frequency resistors are designed to offset these effect.[1]

How many paths are there in a parallel circuit?

At least two paths. Current will divide between them according to their relative impedances.

What would happen if you put a piece of cheese into an electrical outlet?

nothing at all. only if its a moisturized peice of cheese, then maybe it will melt, but hayy that might be pretty cool

What are the different types of electro pneumatics valve?

Electro pneumatic valves are mechanical valves but operated through pneumatic using suitable solenoid coils.

Which material will allow electricity to flow between the battery and the light bulb?

I guess you mean, between a battery and something else.The generic name for materials which allow an electric current to flow through is "conductor". Specific examples include any metal, graphite, ions in a water solution.

What happens if you touch the water in a wire edm when it is running Do you get shocked even though the water is deionized?

I believe nothing would happen to you until the salts and dirt from your hand contaminates the water making it conductive. I wouldn't want to test it and i wouldn't encourage you to. and i don't know what a edm is.

How does the size of the potato affect the amount of electricity produced by a potato battery?

SUM RANDOM: larger potato, more current. ME: i thort it was smaller potato mor current ..... meh?

What does a power strip do?

A power strip is just a place to provide electrical power for a number of devices. While an electrician can create a permanently installed power strip, the most popular types of power strips are those that plug into outlets. Typical uses for power strips include powering computers and entertainment centers.

Power strips tend to have other features such as a power switch, some sort of circuit breaker, and even some power surge protection. There are a few which even contain backup power supplies to give you time to save computer data and power your computer down properly.

How do you isolate an outlet containing an air conditioner so that the AC won't black out the building?

Isolation is not your issue here!

If the overcurrent protection (breakers, fuses) are sized correctly, and the buildings wiring is sound, the A/C would not normally cause any other problem other than to trip its own breaker or fuse.

If an A/C unit is causing the buildings main breaker to trip, you need to have the electrical system for the building diagnosed and repaired.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator

to insure the circuit is, in fact, de-energized.

How can a conductor be made to hold its charge?

It is not possible to make a ordinary conductor hold it's charge permanently.But you can make a ordinary conductor(e.g.,)a wire to hold charge for a short period.This is because a charge stored in a conductor leaks to the surroundings due to ionisation of air.

But it is possible to charge a conductor like a copper sphere. for this the copper sphere is first connected to ground and a negatively charged ebonite rod near it.the copper sphere becomes positive as the negative charges in it flow to the ground.the sphere is disconnected from ground and the ebonite rod is taken away.now the copper sphere holds positive charge.

note:

it is easy to charge an ebonite rod by rubbing it with fur.

Circuit diagram of strong digital satellite receiver model 4651?

You can find a circuit diagram of most digital satellite receivers at many electronic stores. You can also get the diagram from the satellite receiver manufacturer.

What usually cause the star contactor to burn on a star delta starter?

A lot of designers will fit an under rated star contactor, partly for cost saving purposes and partly down to the fact that the star contactor will only stay energised for a brief period.

Burning out the star contactor could be down to it staying in circuit too long, not changing over to delta, a timer malfunction holding in the star contactor or switch that is defective in the control circuit.

Another cause could be your motor is drawing excess current.