0
New Electrical Work
Electrical work ranges from the installation of new electrical components to the maintenance and repair of existing electrical infrastructure. It may also include wiring airplanes, ships and other mobile platforms.
4,938 Questions
Which type of transmission medium consists of a number of individually insulated copper wires?
The type of transmission medium that consists of a number of individually insulated copper wires is called twisted pair cable. This type of cable is commonly used in Ethernet networks for data transmission due to its affordability and ability to reduce electromagnetic interference.
Is 30 amp double pole breaker ok for 4800 watt wall heater?
Yes, a 30 amp double pole breaker would be suitable for a 4800 watt wall heater. Since watts equals volts multiplied by amps, this wall heater on a 240-volt circuit would draw 20 amps (4800 watts/240 volts), which is less than the 30 amp capacity of the breaker.
10ohms is equal to how many volts?
Ohm's Law says Voltage = Current x Resistance.
Hence, if you know ohms = 10 you need to know the current passing through the resistance to know the voltage drop across the resistance. If there were 1 Amp flowing through resistance, you would have 1 x 10 = 10 Volts.
What are two places that neutral buss bar in the service panel can be grounded?
<<>>
You have the neutral coming into the box and the ground wire going to either a grounding rod or the water line where it comes into the house.
The larger the wire the more atoms there are to transfer the electrons through the wire. Induced electrons from a power source bump other electrons out of the orbit of the wire atoms thus causing electrons to flow and the induced electrons fall into the orbit of the wire atom until the next loose electron knocks that one out of orbit to the next atom and the next one etc.. It's like a one way game of bumper cars until the electrons get to the end of the wire and into the next conducting substance. This is also the difference between an insulator and a conductor that is how freely an atom gives up its electron when its bumped.
How do you connect a 3 wire 220v induction cooktop to a 4 wire supply?
Answer for USA, Canada and countries running a 60 Hz supply service.
A four blade range plug is the new code. What should be done is to change the three blade receptacle to a four blade receptacle. The only difference in the receptacle wiring is that the position of the neutral wire and the addition of a ground wire being brought out to the range on a separate blade to match the ground wire on the plug. Turn the circuit breaker that feeds the range to the off position. Opening up the receptacle you will find now, two hot wires to the outside blades and a neutral to the center pin. Look in the back of the range receptacle's junction box and you will see a ground wire wrapped around a screw that grounds the dryer feed wire. From this ground wire add an extension of six inches. This new wire then connects to the fourth terminal on the new four blade receptacle. Looking at the new receptacle you should have the two hot wires on the outside terminals X and Y, white (neutral) W blade and the newly installed ground wire to the U shaped ground G blade. This receptacle is a NEMA 14-50R, 3 pole 4 wire grounding receptacle.
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.
Can you add 100 amps to 200 amp ratred box?
No, you cannot add 100 amps to a 200-amp rated electrical box. The box is designed to handle up to 200 amps safely. Exceeding this limit can lead to overheating, electrical fires, and other safety hazards. If you need more amperage, you would need to upgrade to a larger capacity electrical panel.
Can 15 amp rated outlets be used with twelve gauge wire?
A. It's 240 volts & B. Wire size is a function of amperage. 12-gauge wire is used with 20 amperes or less. So, 12-gauge wire can be used with 120V/20A or 240V/20A. Keep in mind though that 240V in the U.S. has 2 live 120V lines so if you encounter a white wire, it's probably an unmarked live & should be repainted as black or better yet, red (to indicate the 2nd live wire).
How do you stabilize a 220 volt 40 amp supply?
To stabilize a 220 volt 40 amp supply, you can use a voltage stabilizer or regulator specifically designed for handling that level of voltage and current. Make sure the stabilizer is rated for at least 220V and 40A to handle the load effectively. Install the stabilizer properly according to the manufacturer's instructions to ensure it functions correctly and provides stable power output.
How do you add a ground to an old 1920s light fixture?
The only true way to add a ground to an old metallic fixture is by drilling a hole and installing a self threading UL Listed ground screw through a metallic part on the inside of the light fixture. Make sure the surface where the grounding conductor is to be attached under the new screw is clean from any Paint, Tarnish or Rust. Use Emory cloth, sandpaper or a file to do this as it must be a bare metal connection. If you can't find Self threading Ground Screws you can get Electrical Screw tapping tool at your local hardware store and thread your hole for a regular ground screw. You must make sure that all metallic parts of the fixture are grounded or it will become an electrical hazard. If it is going to be outside I would strongly suggest putting it on a ground fault circuit for extra protection. GFCI's measure changes in the circuit to determine if power has leaked from the Fixture/Circuit to something or someone. The best solution is to remove the fixture from service and replace it with a close modern replica.
P=UxI so I=P/U so 600/115=5.21 A ignoring losses
How does a ground wire let electrons get to the ground?
The ground wire (equipment grounding conductor) runs back to the panel then to a ground rod. If there is a ground fault in the circuit, the current will flow on the equipment grounding conductor back to ground.
Electricity follows the path of least resistance. This is why a ground wire is so important and why NOTHING should ever be hooked to a ground wire. It has the least resistance back to source.
How do you know if a GFCI outlet is bad?
The device could be faulty or it could be working perfectly, as they typically do. If you mess about with it without understanding how it works you could receive a life threatening shock. Another likely possibility, as GFCIs are extremely sensitive, is that you have plugged in a piece of equipment which is faulty and that equipment should therefore be thrown away.
<><><>
Depending on what is happening, there could be several possibilities:
A) You have put too many items onto the circuit the GFCI is protecting, so it cannot sense properly and trips, or
B) You have not had it installed correctly, and the Sense Ground wire has become corroded with time and moisture, or
C) The wiring that is further down the line, if it "protects" other sockets and circuits downstream from this one, have problems with the insulation breaking down, or
D) Something else is wrong and you need to call a competent person to advise on your home wiring.
<><><>
If the gfci trips this means there is more than 10mA current between the ground the hot and neutral wires which, in, say, a kitchen or outside the home or in some other damp area, usually means something got wet.
2. If the particular circuit's main circuit breaker has tripped then this particular GFCI outlet cannot be reset and it won't test either, with the power out. If you can reset the circuit's main circuit breaker at the panel, you may then find the GFCI works. A second outlet somewhere in the same room or elsewhere might also not have worked because it is connected to the load terminals of the tripped GFCI.
3. If the circuit's main circuit breaker at the panel can be reset and the GFCI still won't work then you may have a damaged GFCI or there may be some equipment still plugged into it - or into a second outlet somewhere in the same room or elsewhere - that has a fault. so if there is no equipment plugged in anywhere, either at or after the GFCI, get the GFCI replaced.
4. I suggest you probably should call an electrician.
<><><>
The Capacitor on a single phase motor (for a "fan", etc.) sometimes causes a GFCI to trip. Commercial Grade GFCIs are better suited to this application.
<><><>
Two other things can cause false tripping:
1. A noise filter or surge protector in the circuit after the GFCI bypasses high frequency noise to ground. This unbalances the current in the hot and neutral, tripping the device.
2. Dirt or insects inside the outlet box. One time I opened an outlet box that was tripping the GFCI even with no plug in the socket. The box was full of dead roaches. I removed the bugs, and the device started working normally.
<><><>
GFCI circuit breakers perform two functions. If it is a true circuit breaker it will prevent "over-current" conditions from overheating the wiring of your home and hopefully minimize the potential for fire. All circuit breakers and fuses are designed to 'trip' or 'blow' when an over-current condition exists. GFCI circuits have an additional function. To prevent or minimize the potential for hazardous shocks, GFCI circuits compare the current that goes across the two wires that make up the hot and common voltage lines of an outlet. If the current on the two wires does not match precisely, the assumption is that current is being lost to something outside of the circuit. This condition is called a "ground fault". In simple terms, it means that there is high potential that YOU are grounded, as in standing in a puddle of water, and YOU have touched the "hot" side of the circuit or the device somehow allows current to go outside of the normal voltage path. A ground fault can exist if an outside outlet has become wet with rainwater, or an outside extension cord is laying in water or an appliance is in the process of failing and voltage leaks to the ground wire. But as already mentioned, it can also indicate that the GFCI has failed, although that doesn't often happen.
<><><>
A GFCI [Ground Fault Circuit Interrupter] trips when it senses a ground fault. In a correctly wired circuit the return path should be on the neutral wire. The circuit will trip if the GFCI senses a difference in the current (amps) in the Black "hot wire" from what is returning in the White "neutral wire". The two current values should be the same unless you are leaking electricity, which is called a ground fault. This can happen in a wet location when electricity is using the water as its ground and not returning back through the neutral wire. Older motors can also leak electricity in to their motor housings. If the electricity is not returning through it's designed path then you may have a safety hazard and your GFCI is protecting you.
To test a tripping GFCI follow these steps.
1. Remove every appliance connected to the GFCI's circuit and then try to reset it. If the GFCI doesn't reset there may either be a wiring fault behind a socket outlet or your GFCI itself has become faulty.
2. Make sure what whatever you are plugging in to the GFCI is dry and not damaged.
3. Only plug in one item of electrical equipment at a time. If you are plugging in a defective item it will cause the GFCI to trip and that item should be replaced.
<><><>
From what this question is saying, the TEST button is doing its job - it is testing ( = checking) that the GFCI is working correctly!
After you have tested the device by pressing the TEST button you should be able to press the RESET button again - and DO NOT PRESS THE TEST button again - and everything should work.
Either your GFCI is bad [in which case replace it] or it is working perfectly.
<><><>
It is probably working. My sister had a similar problem. She just kept resetting until it held, but every time she got in her hot tub she got shocked.
Luckily she wasn't killed. It turned out to be the fly weights shorting out against the capacitor wires, turning the water into the hot leg. Don't mess around with this kind of problem.
<><><>
Another possible cause for tripping a GFCI is radio frequency energy. If you are close to a transmitting station this may occur. I have seen a GFCI trip when a car, equipped with a transmitter, pulled into a driveway and keyed up the transmitter. If the output is high enough and/or at a particular frequency, this may happen. If so, the GFCI(s) may need to be shielded.
<><><>
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 wire size is used in the 60 amp low voltage cable?
The wire size typically used for a 60 amp low voltage cable is AWG 6 or AWG 8 depending on the specific application and voltage requirements. It's important to consult the manufacturer's specifications for the appropriate wire size for your particular setup.
The bare stranded copper ground wire typically shipped with secondary distribution centers is most commonly sized at 4 AWG (American Wire Gauge). This gauge is commonly used to provide a reliable grounding connection in electrical systems.
The compressor overload should be set at at how many amps?
The compressor overload should generally be set to trip at around 10-15% above the rated running amps of the compressor motor. This helps protect the compressor from overheating and potential damage during prolonged overcurrent conditions. It is recommended to refer to the manufacturer's specifications for the exact amp rating.
Why is copper wiring coated with insulation?
Because if the wire is "hot", that is, has electricity flowing through it, and you touch a bare wire, then YOU become the "ground" and complete the circuit. This will cause at the least a bad shock, and at the worst it will cause death. The "ground" wires are bare, but that is because they do not have electricity flowing through them unless something shorts out (ie a "hot" wire which is normally black or red in color touches a ground or neutral wire which is normally white. The "ground" wires are either bare or have a green coating.
How many watts in 1 milli amp?
This would depend on the voltage. There is a formula you use to figure wattage which is amps X volts = watts. Since a milliamp is 1/1,000th of an amp, then if the voltage is, say the standard 120 volts AC then 120 X 1/1,000th = .12 (12 one hundredths of a watt) watts. If the voltage was the standard 12 volts DC then it would be 12 X 1/1,000th (or 0.001)= 1.2 watts
How many ceiling fans can be run on a 20 amp breaker?
There should be a rating panel on the fan. Let's say it says 2A. You should not load the circuit any more than 80% of breaker rating. In our example 80% of 20 A is 16 A so you could handle 8 fans if they were 2 A each. However, the starting current of motors is higher than running current. Depending on speed setting of fans and if they are all started at the same time, the number may be less than 80% of load. Find the rating of your fans and do the calculations.
Can too much current on a breaker cause it to blow up?
The breaker will trip to the off position because of the heat caused by more amps than it is rated for. Only lightening strikes do odd things. And a loose breaker connection can arch causing limited damage to breakers.
<<>>
Only under extreme circumstances, like a lightning strike to the mast head. Breakers have a current interrupting rating. For a small home distribution breaker rated at 15 amps, it has an maximum RMS symmetrical interruption of 10,000 amperes. The breaker will not blow up but it will stop the current flow up to 10,000 amps. Under normal operation the breaker will trip when it reaches its operational set point, meaning that when the load current goes beyond the breakers rating, which is found on the handle, it will disconnect the circuit load.
Which wire is smallest in AWG?
The larger the AWG number the smaller the wire. 10 AWG wire can carry more current than 12 AWG wire.
The wire sizes of 24 and 26 are the smallest that are used in the electrical.
See related links below
Does a 100 watt dc motor put out 100 watts in reverse?
Yes it can but it is a bit more complicated then that. The motor that is rated at 100 Watts will draw 100 watts electrical power, but will only output 70-80% of that in mechanical power. So in order to get 100 watts back out you would have to put in ~120 watts of mechanical power to get 100 watts electrical back out.
Watts is what you get by multiplying Amps times Voltage, so unless you know Voltage there's no way of telling. For 100 Volts you'd get 250 Watts at 1 amp, for 50 Volts you get it at 5 Amps, and so on.
