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Electrical Wiring
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4,935 Questions
In electrical terms it represents Rigid Steel Conduit. It is also known as Rigid Metal Conduit (RMC).
This is not to be confused with Electrical Metallic Tubing (EMT) also known in the trade as thin wall conduit.
When did insulation paper on sockets become out dated?
The last I remember seeing cardboard lamp socket shell insulation was the late 50's or early 60"s. Going on the internet it looks like they can still be bought today for special applications. Once PVC became prevalent as an insulator in the electrical trade, the cardboard insulators were phased out.
Yes, most modern electrical tape is a mixture of polyvinyl chloride, one or more plasticizer chemicals, and a layer of adhesive.
The old black electrical tape was usually cotton cloth (a mixture itself), unvulcanized rubber (a mixture itself), and a layer of adhesive.
Before electrical tapes with an adhesive layer were developed a layer of unvulcanized rubber tape was wrapped around the joint then that was wrapped with a layer of friction tape (a mixture of cotton cloth and sticky unvulcanized rubber and sometimes an abrasive to increase friction) to keep it in place. The layer of unvulcanized rubber tape would slowly over time fuse with itself forming a one piece insulating rubber tube around the joint. However both it and the rubber in the friction tape would eventually deteriorate, crumble, and flake off exposing the wires!
Double pole Single Throw switches are sometimes called DPST switches. Assuming the circuit is single phase two wire system, DPST - are used to isolate the ciruit. Isoloation occurs on both terminals hence it is called double pole. This isolation occurs at only one end in the circuit, hence it is called single throw.
How many watts does it take to run a 7.2 amp battery charger?
You need to mention the voltage to calculate the wattage
Which property of Electric current is used in electrolysis?
Probably the fact that a typical electric current is made up of moving electrons. Also, the fact that it carries energy.
If you are asking about a light bulb, the threadlike conductor, often of tungsten, that is heated to incandescence by the passage of current
How can I find a short in my wiring that keeps popping the breaker?
The first thing to do would be to unplug everything that might be plugged into that circuit. It might be an external device that is tripping the breaker. If you know an electrician see if he will help you as thing can get complicated with this type of troubleshooting.
Usually the wiring in the wall does not fault unless someone has driven a screw or nail into it. The fault will be in the junction box so look for burn marks inside the junction boxes. It could be as simple as a ground wire touching the "hot" terminal of a switch or plug that has just be changed out for a new one. If there was some DIY work done on that circuit, check that part of the circuit out first.
The very first thing to do is to turn the breaker off, remove the electrical circuit from the breaker that is tripping and then turn the breaker back on to determine that it is not a faulty breaker. With the circuit wire removed from the breaker, the breaker should not trip. If it does change the breaker out for a new one.
The second part of trouble shooting the circuit is going to entail turning the breaker on and off with exposed wiring open at junction boxes. If you are not confident that you can do this, hire an electrician. Trouble shooting this type of electrical fault is time consuming. I like to determine where the middle of the circuit is and open that junction box first. This will let you know if the fault is upstream or downstream from this junction box.
Once you determine approximately where the middle junction box of the circuit is, it has to be opened and the wires removed from the device that is located in the box. Make a detailed diagram of how the device is wired into the circuit and what wires are spliced together in the back of the box that you are working on so that the box can be reconnected the same as before you took it apart. Once the wires are all seperated from each other, turn the breaker on and see if the breaker trips off.
If it does not then the fault is downstream from this box. Put the wiring back together the same as it was and move on to the next box downstream and do the same procedureon that junction box. If the breaker trips then the wiring has a fault between the breaker and the box you chose to open the circuit at. Again put the wiring back together the same as it was and move on to the next box upstream and do the same procedure on that junction box. Continue with this same type of procedure until you find out what junction box connection is tripping the breaker.
Can a single pole switch replace a starter in a tube light?
No. Starter comes in the circuit initially and then cuts off once the tube is on. If you use the switch, it wont be cut off automatically. If you want to use the switch manually then it technically possible to do so
How do you replace a European plug with a North American plug?
I would caution you that it might be dangerous to do that. The voltages of the electricity supplied to houses in some European countries differ from the one on this continent. For anything short-term, they sell converters that can protect your equipment when plugging into a non-standard outlet, which would be much safer.
However, to answer your question, in a European house you would need the final line transformer providing 230V from the power company to have a center tapped neutral, which they do not currently have, and so you would have to have a custom transformer... who knows what that would take in terms of safety regulations or permits.
(In the US 240V is the main voltage coming into the house, and they use a center tapped transformer secondary tied to house neutral on the house side. The voltages available inside the US house are 120V from each line to neutral and 240V from line to line.)
Can you run a bar fridge on a 650 w generator?
Yes, as long as the bar fridge wattage is less than 650 W
What would cause high voltage drop readings?
High resistance on the feeder to the load will cause voltage drop at the load end of the circuit. If this is happening, do the calculations for voltage drop, using the amperage of the load, voltage of the load, the size of the wire feeding the load and the distance from the distribution panel to the load.
What happens when there is no plastic coating on a electrical wire?
Nothing happens. The wire will still conduct electricity. An example of this is the overhead utility wiring. The insulation on a conductor is there strictly to keep the conductor from touching any thing that would ground the conductor. This grounding could be from another adjacent conductor or a grounded medium around the conductor. A grounded conductor will trip the over current protection and trip the circuit off line. Without an insulation on the wire multiple wires in a conduit could not be utilized.
A splice box is the same terminology as a junction box. The function of a junction box is to suppress the spread of fire. In an electrical system the most likely spot for a fire to start is where wires are connected together. Loose connection of joined wires will create a resistance point.
Over time with the current flowing through the connection it will heat and cool. This increases the resistance.
Without repairs to this situation there will come a time when this heat will reach a combustible temperature.
Depending on the type of junction box, it will suppress the spread of this fire by cutting off or limiting the oxygen supply to the fire.
If the wire connection splice was in an open wall, adjacent to combustible products, the fire could spread to wall studs and then combustion could overtake the whole building.
What is the function of synchronizing lamps?
The light system of paralleling generators has lamps hooked in series and connected between the hot lead of the lead generator and the hot lead of the lag generator. When one generator is running faster than the other one, the lights will blink off and on as the generators come in and out of phase with each other. Adjusting the throttle of the lag generator and bringing it closer to synchronise speed will cause the lights will start to pulsate slower and slower until they go off for a period of seconds and then on for a period of seconds. At this point the two generators are electrically paralleled. Count the time between on off on of the lights. At half the off time (zero voltage) throw the switch and the generators will lock together, the two generators will be running in parallel with each other. Manually to keep them paralleled requires a bit of work, as the faster generator will try and take the load and motor the other one. This is where a governor is a great asset. If the generators are tied together out of phase two things could happen. The least problematic would be the generators breaker will trip. The second and most dangerous is if the lag generator is just a little bit out of phase when the switch is thrown, then the generator will be jerked into phase lock as momentary heavy current flows between the two generators. The sudden loading of the generator has been known to break crankshafts of the engine driving it.
LRA is 134 AMPS. what size breaker should be used?
LRA (locked rotor amps) is not used to calculate the breaker size. Breaker's are used to protect the size of the conductor that is connected to it. Motor calculations are based on the motor's FLA (full load amps).Conductor size is 125% of the motor's FLA.
Breaker size is 250% of the motor's FLA.
This is the only occasion when the breaker is sized larger that the conductors maximum amperage rating. This is due to the motor drawing up to 300 to 600% of its FLA when starting.
If you state the motor's wattage, voltage or amperage this calculation can be calculated here.
Where can you buy a t 3.15a l 250v fuse It is for a Harman Kardon subwoofer?
The fuse is a time delay (also known as a slow blow), 3.15 amp, glass low breaking capacity fuse. The fist thing that should be done is to find out what caused the fuse to blow in the first place.
The first test should be to put a cheap 3 amp fuse of the same physical size into the fuse holder and turn the unit on. It doesn't matter about not having the .15 amps on the end of the 3. If the problem is caused by a short circuit the .15 amp is not going to make any difference.
If the fuse blows again then more investigation should be forthcoming. With the unit unplugged, open the unit up and give it a visual inspection. Check around the transformer to see if any of the wires have shorted out. Check the PC boards to see if there is any burning of the traces.
If you can find nothing, check with the manufacturer to see if they can help you out. The manufacturer will also guide you to where spare fuses can be purchased. If the amplifier is sent back to the manufacturer they will repair it if necessary and it will come back to you with a new fuse in it. Ask for a couple of spare fuses from them when they send it back.
What type of panel should be used in 3 phase 400 amp?
The type would be a three phase panelboard. If you are carrying the wye neutral into the service, then it would be a three phase four wire distribution panelboard. Regardless of the style used, it would have to have a minimum 400 amp bus.
What does a ladder diagram for a flashlight look like?
In North America the diagram will have a left and right supply rail. The rungs are between these rails in a horizontal position. Usually the voltage supply is on the left and return to source is on the right. The rung will consist of a switch in series with a lamp drawn from the left rail to the right rail. That's it.
In European countries the rails are top to bottom. The rungs are between these rails in a vertical position. Usually the voltage supply is on the top rail and the return to source is on the bottom rail. The rung will consist of a switch in series with a lamp drawn from the top rail to the bottom rail.
Can you get a replacement handle for the h364rb square d disconnect box?
Not from the manufacturer. You may have some luck in finding one from a distributor that deals in usable used electrical equipment. A new switch is over one thousand dollars so I understand why you are looking for a replacement part. As electrical companies are going around buying each other out and discontinuing the bought company's product new businesses are springing up buying the bought companies product. Check with electrical wholesalers in your area as they know and send some of their customers to these resales outlets to help them out of a problem.
