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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
What is the function of the neutral wire in a plug?
The green (or green with yellow strips) is for Earth. This is the D shaped socket in a US outlet. The Black (US) or Brown (UK) is for Live. This is the narrow rectangular socket on a US outlet. The White (US) or Blue (UK) is for Neutral. This is the wide rectangular outlet on a US socket. The color code may vary for other countries, so be sure to check.
What cannot be considered a single phase?
A heterogeneous mixture, such as a salad with different vegetables, cannot be considered a single phase. It contains distinct regions with different compositions and properties, making it a multi-phase system.
How many amps does a single phase 115 volts 1 hp 60hz pump draw?
Since one horsepower is 745 watts, a 115 volt 1 hp motor would pull about 6.5 amperes, depending on power factor.
Note:
That may be a theoretical value. However, practically speaking, single phase A.C. motors are notoriously inefficient. That is the reason the National Electrical Code lists the full load current of a 1 HP, 115 volt motor at 16 amps. That value is considered nominal and can vary depending on motor design. That value does not begin to factor in inrush current.
The best advice is to utilize the manufacturer's motor nameplate value.
What is the normal voltage of electricity for house in Singapore?
The standard voltage for electricity supply in household buildings in Singapore is 230 volts.
Why are center tapped transformers used in North America?
Center tapped transformers are used in North America to be able to use two voltages from the transformers secondary. It is known as a three wire system. Appliances circuits that utilize 240 volts and appliances that use 120 volts can be supplied from one transformer. The transformers secondary is center tapped and grounded. This allows the 240 volt winding L1 - L2 to produce 120 volts from one leg of the winding to ground L1 - N and the second half of the winding 120 volts from N - L2.
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Center tapped transformers are used anywhere world wide where ever they were designed to be used.
There is nothing particular to a center tapped transformer that makes it more or less suitable for use in North America.
Is there a liquid that electricity can't pass through?
Only in some cases. Electricity can be conducted by a liquid containing electrolytes, or dissolved ions. Deionized water will not conduct electricity, however a solution of salt, or any other ionic substance, will.
Sunlight warms the ground, then heat is absorbed by the air which therefore expands and rises, then rising air molecules rub against other air molecules and develop static electric charges, and then the total of these static electric charges inside a cloud can eventually create a sufficiently high voltage that the electric field can ionize the air, creating a conductive pathway through whcih the electricity flows, in the form of lightning.
Looking at an electrical plug in the wall you will see two parallel slots. With the ground pin on the bottom, the slot on the right is the hot pin. The slot on the left, which is longer, is the neutral pin. Installing a receptical, the terminals on the back are brass screw to the hot wire and silver screw to the white. Brass, Hot - Silver, White, easy to remember that way.
How do you identify a hot or ground wire that is exposed?
To further ID the wires, use a voltmeter.
Measure between the Neutral and the Hot and you should have current (120 Volts?).
Measure between the Hot and Ground and you should have the same current. Between the Neutral and Ground there will be no current.
If you don't have a voltmeter, you can use a lamp rated for the current in the wires you're trying to ID (ie, a 120 volt lamp if it's a 120 volt circuit).
Wire the lamp between the Hot and Neutral, and it should light up.
Wire the lamp between the Hot and Ground, and it should light up.
Wire the lamp between the Neutral and Ground, and it should not light up.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
How does a car battery get recharged?
A battery produces electricity through a chemical reaction. In some case this chemical reaction can be force backwards by the application of ... In some case this chemical reaction can be force backwards by the application of and electrical current in opposition to the one generated by the batter. ...
What table in NEC would use to find FLC of a 3 phase motor?
To find the full-load current (FLC) of a 3-phase motor, you would refer to Table 430.250 in the National Electrical Code (NEC). This table provides the FLC values for various types and sizes of motors.
Is the pigtailing method the best procedure when updating house wiring?
If you are changing your plugs and switches in your house, this is the best procedure to use. What this allows is that, in the future, devices can be changed out without opening the line supply and neutral wires. It is dangerous to open wires that could have a potential on them.
For a description of how to actually do "pigtailing" you should at least read a book about the techniques used to install electrical wiring or - much better - attend a local training course or ask a friend who is a licensed electrican. It is always important to know about - and follow - the wiring codes and regulations which apply to your home area.
<><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
How do you convert 7620 volts to 240 volts?
To convert 7620 volts to 240 volts, you would need to use a transformer. The transformer would step-down the voltage from 7620 volts to 240 volts. The ratio of the turns on the transformer primary and secondary windings determines the voltage transformation.
What is the purpose of conducting sc and oc test of single phase transformer?
The purpose of conducting sc (short circuit) and oc (open circuit) tests on a single-phase transformer is to determine its equivalent circuit parameters, such as the winding resistance, leakage reactance, and magnetizing reactance. These tests help to evaluate the transformer's performance and efficiency under various operating conditions.
How to convert 440 VOLTS to 380 VOLTS?
You can use a transformer to step down the voltage from 440 volts to 380 volts. Make sure to use a transformer that is rated for the required input and output voltage, and have a qualified electrician perform the installation for safety.
Does the code state how many receptacles are allowed on a 20 amp circuit?
Answer for USA, Canada and countries running a 60 Hz supply service.
Allow for 1 amp per receptacle and then load the circuit to 80% of maximum.
In the US and in every building except homes, code limits you to 13 receptacles per 20 amp circuit. In a home there is no limit because it is assumed that even if you put a receptacle on every stud, you couldn't possibly use them all.
Further information
In the United States in non-dwellings a circuit is limited to the number of receptacles a circuit can handle, calculating 180watts per duplex. This places a 13 receptacle limit on 20 amp / 120v circuits and a 10 receptacle limit on 15 amp / 120v circuits.
In dwellings there is no limit on the number of receptacles that may be placed on one circuit since it is highly improbable that you could overload a residential circuit under normal circumstances.
In dwelling kitchens, while there is still no limit in the number of receptacles, there is a requirement that counter tops be served by AT LEAST 2 SMALL APPLIANCE CIRCUITS RATED 20 AMPS.
<><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What lasts longer a dimmed light or a fully powered light?
The mechanism that fails in an incandescent lights is the filament. It degrades over time because of current flow. Hence, you would expect the dimmed light (less current) to last longer. This would not necessarily be true for other types of lights.
Which leg is 208 on 3 phase power?
On three phase 208 volts one leg does not have the potential of 208 volts. It takes two legs to provide the 208 volts. The potential is across AB, BC and CA. Voltage to the grounded neutral A-N, B-N and C-N will produce a potential of 120 volts. In a wye configured secondary three phase four wire you have the potential of 120/208 volts.
Does current or resistance cause breakers to trip?
Excessive current is what causes circuit breakers to trip. When the current in a circuit exceeds the rating of the breaker, it trips to prevent overheating and potential fire hazards. Resistance itself does not cause breakers to trip, but it influences the amount of current flowing in a circuit.
What is the color of insulation over an earth wire?
The insulation will be green in colour. Also bare copper can be used as a ground wire.
The term, single-phase 'panel', describes an electricity distribution panel (called a 'consumer unit' in the UK) comprising line, neutral, and earth (ground) busbars, supplying a number of circuits which are each protected with either a fuse or a miniature circuit breaker. The panel normally incorporates an isolation switch that will disconnect the busbars from the supply system. The panel is fed from the utility company's supply system, via a fuse and energy meter.
Some 9 V adapters rated for 1000 mA will provide 9 V at 1000 mA. If you use it on a 200mA device the voltage may go up to 10-15 V and if that device can not handle the higher voltage, it it could burn out. Better adapters will only put out 9 V exactly and have no problem. Be careful of revere polarity where the positive on one is the negative pin for the other adapter.
Generally, the screws that the wires go on are color coded. The two hot wires(black & red) go on the brass colored screws, the white goes to the silver screw, and green goes to the green screw. There are many variations on the configuration of the plug, so no answer would be foolproof. There should be some kind of diagram that came with the plug though. It would also be best to turn off all breakers to the load, and check for proper voltages when the generator is running before turning breakers back on and using the power.
What is the amount of fossil fue l that can be extracted at a profit?
The amount of fossil fuel that can be extracted at a profit depends on various factors such as extraction costs, market demand, and regulatory environment. It is difficult to determine an exact amount as it varies by region and type of fuel. Advanced extraction technologies and market conditions play a significant role in determining the profitable extraction limit.
Why is 220 volts the main voltage in the Philippines?
1) Possible... You can buy a converter in any electrical supplies store.
Plug in your appliance(s) in this converter then plug the converter
into your 220V outlet.
2) Most of the Automatic Voltage Regulator has a 110V outlet. Plug in your
appliance in this outlet and plug in the AVR in the 220V outlet. Hope I help you
