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
Is a red wire a grounding wire?
Yes, red is used to identify one of the HOT (live) wires for 240vac systems (black is the other HOT wire). Theoretically you have twice the chance of electrocuting yourself with 240v versus 120v because CURRENT = VOLTAGE / RESISTANCE. Twice the voltage, twice the danger. 1/10 of an amp through your heart will KILL you. If you come in contact with 240vac and assuming your body's resistance cold be as low as 300 ohms, you could experience 0.8 amps (8 times what it takes to stop your heart). Note, 120vac can still give you a 0.4 amp jolt which is plenty enough to kill you.
What is 50 millivolts equal to in milli amps?
Milli volt is one thousandth of a Volt and Milli amp is one thousandth of an Amp. Volt and Amp measure two different things and are not really comparable.
Over simplified, here is how it works. Volt measures the 'pressure' that causes current to flow. Current flow is measured in Amps and depends on the how much resistance the 'pressure' has to overcome. Higher the resistance, lesser the current (Amp) for same pressure (Volt)
Does a sub panel need a ground conductor from main panel?
Answer for USA, Canada and countries running a 60 Hz supply service.
Yes, you have to have a ground rods connected to the system. This is especially important in North American systems as a split phase is in use. The center-point winding by code must be grounded. This is a backup in case the neutral conductor becomes open. If this backup was not in place, due to the configuration of the distribution panel, 240 volts could be applied across two 120 volt loads which would be a series connection. If the resistance across both of these series loads is equal nothing will happen as the voltage drop would be even at 120 volts. If the series load resistances are not even then uneven voltage drops will appear. This could cause higher that allowed current to flow through devices that would damage them. Periodic maintenance of the ground rod connections should be done by every homeowner to make sure the connections are clean and tight.
Why does a light turn when you place black to black and white to ground wire?
You don't say "turn off" or turn on". Light should be connected black to black and white to white and ground to ground. If you connect white to ground it will work, but you are then using the ground wire for an unintended purpose. Neutral is bonded to Ground at the panel. Current on ground wire could cause ground loops and may cause GFCI to trip if you have them in your house.
What is the remote switch wire for an ATX or BTX power switch connected to?
The remote switch wire for an ATX or BTX power switch is typically connected to the motherboard's front panel header. This header is where you connect various front panel connectors, including the power switch, reset switch, power LED, and HDD LED. The specific pins differ depending on the motherboard model, so it's important to consult the motherboard manual for the correct connection.
Will a breaker trip if it is being fed from the load side to energize the bus in the breaker panel?
A breaker should never be fed from its load side to energize the bus in the breaker distribution panel. This question suggests that you are trying to connect a generator to back feed your electrical panel during a power failure. This setup as killed linemen trying to repair the downed primary lines. If the panels main breaker is not opened, the generator will back feed the pole transformer that the linemen are working on and bring the line potential up to 14,000 volts. There are proper change over switches in the market now that will allow you to run your generator and the switch will automatically disconnect the utility connection before making the connection to the house panel. If this is your line of thought, do a bit of research on the subject. The last thing people in the trade want to hear is another lineman getting electrocuted.
If the load exceeds the rating of the breaker and the breaker is functioning properly, it will trip.
How do you calculate wire size needed for a 100 amp load?
Depends on the utility jurisdiction. In general, 2/2/2/4 aluminum seu will suffice for out buildings. Check with your local building code department.
<<>>
A #3 copper conductor with a insulation factor of 75 or 90 degrees C is rated at 100 and 105 amps respectively.
A #4 aluminium conductor with a insulation factor of 75 or 90 degrees C is rated at 100 and 105 amps respectively.
Do you need a neutral wire for a light to work?
In most cases, yes. A neutral wire is usually required for a light to work properly, as it completes the circuit and allows electricity to flow to and from the light fixture. If there is no neutral wire, the light may not function correctly or at all.
Will a 12v 1300ma operater a 12v 2.0 amp chair?
No, a 12V 1300mA power supply will not be sufficient to operate a device that requires 12V 2.0A. The device will not receive enough current to function properly and may be at risk of damage. It's important to match the voltage and meet or exceed the amperage requirements of a device when selecting a power supply.
Why solder wire is used for welding electrical wire?
gavaron khudko nahin aata to mere paas chle aaye !!
<<>>
In North America this procedure is not allowed any more. It was dismissed from use when knob and tubing wiring became obsolete. Now proper approved connectors have replaced the old solder pot. Junctions are now made in electrical boxes where as with knob and tube, the splice just required a half western splice, soldered joint and wrapped with friction tape.
What size of wire you need for a 42 amps heater?
For a 42 amp heater, you would typically need to use a wire size of at least 8 AWG (American Wire Gauge) to ensure the wire can safely handle the current without overheating. It is recommended to consult the National Electrical Code (NEC) or a qualified electrician for specific guidance on wire sizing for your application.
Which is the hot wire if there are both black and red wires?
The hot wire could be either the black or red wire, as both are commonly used for hot wires in electrical wiring. It's important to use a voltage tester to determine which is carrying the current before working on the wires.
Can two electrical outlets be in same stud wall cavity in a fire wall.?
I`m not an electrician but have done some commercial renovations and I believe you should not have holes in a bay on both sides of the wall. if the outlets or switches are on the same side its ok. but check with your electrical inspector.
What size of wire need to test using megger?
A megger is used to test insulation values. It doesn't have to be wire only. Any device that has electricity flowing through it can have its electrical insulation properties checked to see if there is any current leakage to ground. So to answer your question any size wire's insulation can be megger tested.
When wiring a wall switch which color wire goes on the common terminal screws?
A typical switch doesn't have a Common screw in the strictest sense, it just has two screws which are each side of the switch. You probably have a a 3-way switch. If you are hooking up a 3-way switch as a normal switch, then connect the Black (Hot) wire to the common and the load to the side of the switch that makes UP the on direction and DOWN is off and doesn't get connected.
You can determine for sure if you have a 3-way switch because the word ON and OFF don't appear on the toggle.
How much does it cost to install distribution panel box with 20 circuit breaker space?
The answer to this question depends upon the amperage that you want the panel to carry. Most new installations in new homes these days use a 200 amp panel with 42 circuit spaces. In Canada, installed by a certified electrician, a 200 amp service complete with permits taken out and inspection by the electrical inspection department costs about $2000.00.
Do dishwashers have electrical resets on them?
Yes, dishwashers typically have a reset function that can be used to troubleshoot electrical issues. This can involve turning off the power to the dishwasher, waiting a few minutes, and then turning it back on to reset the electrical components. If the issue persists, it may require further investigation by a professional.
When do you use a conduit bushing?
A conduit bushing is used when a conduit is terminated in a junction box or enclosure. Its purpose is to provide a smooth rounded surface so that when the wire is pulled into the conduit the insulation on the wire will not be damaged.
How many watts are in 30 volts?
To calculate the power in watts, you will also need to know the current in amperes. The formula to calculate power is P (watts) = V (volts) x I (amperes). If you only have the voltage (30 volts) and not the current, you cannot determine the power in watts.
What is meant by tinning stranded wires?
It is a reference for the preparation for soldering a stranded wire so you get a good joint. You twist the strands together, heat the wire with a soldering iron or gun and then apply a small amount of solder on the tip of the wire and it melts into the strands. Then you can solder the wire to another like wire or to a terminal or whatever. You basically reheat the wire to make connection and can add more solder as needed.
Additional informationTinning is also useful if the wire is to be put in a "screw lug".The term "tinning" comes from the fact that older solder contains lead and tin. Some of the newer solder is supposed to be lead free.
What is the amp capability of 600 volt wire?
The current (amp) capability is determined by the wire size in gauge, rather than the voltage rating stamped on the insulation.
The most basic rating is 20 Amps for 12 gauge and 15 Amps for 14 gauge wire; however, it can get more complex than that for long runs of wire or for wires run through conduit with other wires. Hire an electrician if this sounds bewildering.
There are NO watts in 600 Volts. Voltage represents a potential to do something. Watts is a measure of power. They are related as follows:
Watts = Volts x Amps x Power Factor
Volts is potential, amps represents current flow from the potential and the Power Factor represents how the current and voltage waveforms are in synchronization or not. Therefore, to know watts you need to know something other than just the voltage. The good news is that the Power Factor is one for a resistive load like a light bulb.
It's 60 thousandths (0.060) of an ampere. The "m" stands for "milli", a prefix that means "thousandth". The correct way of representing it is "60 mA", with the "A" capitalized and a space between the number and unit of measure.
How far should wall heater be from electrical outlet?
Code requires them to be on any wall over 30" long and no more than 10 feet apart on other walls, except in the kitchen over the counter where they need to be no more than 5 feet apart. As an electrician who has wired 1000's of houses I always reccommened that you put in as many as you want and a couple extra as it is can be very costly to add more later.
