# Electrical Troubleshooting

## Electrical troubleshooting involves checking and resolving an electrical problem (such as when an electrical device stops working correctly). Common troubleshooting practices include checking if the power is on, the bulb has burnt out, or the breaker tripped.

###### 2,086 Questions
Electrical Troubleshooting
Industrial Electricity and Electronics
The Difference Between

# What is the difference between Kilovolt Ampere and Kilowatt?

A kilowatt is an unit of true power in an AC circuit -as measured by a wattmeter.

A kilovolt ampere is an unit of apparent power in an AC circuit, which is the product of the voltage across a load by the current through it.

The relationship between the two is: kilowatt = (kilovolt ampere) x (power factor of load)

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Home Electricity
Electrical Wiring
Electrical Troubleshooting

# 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.

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Home Electricity
Electrical Troubleshooting

# How do you turn off a pole top switch?

A high voltage pole top switch has joined linkage from the top cross-arm switch to a D handle at ground level. This switch is kept in a padlocked state when open or closed. When the switch needs to be opened by linemen it is unlocked and the D handle is moved to the down position and re locked. This is so that the switch does not get inadvertently closed, and the line becomes re energised, while workmen are still on the circuit.

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Electrical Wiring
Electrical Troubleshooting
Industrial Electricity and Electronics

# What is LT panel in spinning mill?

if electrical panel is labeled LT, usually means its a lighting panel

LT means "Low Tension" panel. Not lighting.

Lighting panels are normally known as LDB (lighting Distribution boards)

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Electrical Troubleshooting
Electrical Wiring

# What colour is L1 and L2 in electrical terms?

Answer for USA, Canada and countries running a 60 Hz supply service.Typically black and red. Neutral is usually white.

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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.

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Electrical Engineering
Electrical Troubleshooting

# How can burn three phase ac motor?

how can burn three phase motor in single phase

A motor burns due to continuous over load or short circuit with in the winding. Water entry, exposure to moisture, bearing failure, over load - burn the motor.

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Modification of Old Electrical Work
Electrical Troubleshooting

# What is 277VAC?

It is the leg to ground or (star point) of 3 phase 480 volts. 480/1.73 = 277 volts

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Electrical Engineering
Electrical Troubleshooting
The Difference Between

# What is difference between kw and kva?

kW is the unit of real power & kVA is the unit of Apparent power.

Apparent Power= real power + reactive power

Besides this,the ratings which we write on a motor or generator is KVA & not KW. B'coz there are two types of losses in a motor or generator- core losses & ohmic losses. Core loss depends upon the voltage applied & ohmic losses depend upon the current flowing & none of these losses depend upon the power factor i.e. Cos@. As we know that

KW power = V * I *Cos@.

But as the losses are independent of the power factor hence we need to calculate only KVA = V*I.

Comment

Apparent power is the vector sum of real power and reactive power, not the sum.
KVA is the unit of apparent power and KW is unit of active power.

KW is kilowatts, and KVA is kilovoltamps. KW is the apparent power that a normal power meter would measure, while KVA is simply the maximum of the instantaneous product of volts and amps divided by 1000. The difference between these two terms is due to phase angle, which is due to the reactance of the load to an AC power source.

KW (kilowatts) is apparant power, while KVA (kilovoltamps) is true power. They are different when the phase angle between voltage and current is not zero, i.e. when the load is reactive, such as in a motor. The ratio of KW over KVA is Power Factor, and is the cosine of the phase angle between voltage and current. It is zero at a phase angle of 90 degree, which occurs for purely (ideal) inductive or capacitive loads with no resistance in the source or conductors, and it is one for purely resistive loads.

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Home Electricity
Electrical Troubleshooting

# Why does the 59n relay keep tripping the breaker?

The 59 relay is an overvoltage relay. The 59N relay is an overvoltage relay for the neutral circuit. Check neutral and make sure the system is properly balanced.

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Electrical Troubleshooting

# What causes an electric motor body to give an electric shock when a person touches it and the ground together?

That condition is called a "ground fault". That's when the insulation of the motor winding has a break somewhere, allowing current to leak to the motor housing.

The motor SHOULD be grounded, protecting the user from electrical shock, but many older motors were not grounded, providing the potential for just this type of condition.

Newer motors are often "double insulated", meaning that not only is the motor winding insulated, the motor housing is also insulated. Often the housing of a double insulated motor is made of a type of plastic.

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Electrical Troubleshooting

# Do emergency Lights have to be on all the time?

No. Emergency lights are designed to turn ON when there is a power loss or outage either from their back up battery or from an emergency generator. In buildings which do not have back up emergency generators, (which most are) emergency lights require power supplied to them 24/7 to keep their batteries charged.

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Home Electricity
Electrical Troubleshooting

# Why do WE have electricity?

Because we are not OMISH.

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Home Electricity
Electrical Troubleshooting

# When did electricity come into general use?

1930 for most homes

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Home Electricity
Electrical Troubleshooting
Electricity and Magnetism

# What is stationary electricity?

Stationary electricity is..... well electricity that is not moving, electricity remains static when it is on the surface of an insulator, thats about all I know,

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Modification of Old Electrical Work
Electrical Troubleshooting
Batteries
Furnaces

# What causes lights to dim when the furnace and refrigerator motors come on?

A loose or disconnected neutral wire at breaker box or at the appliance. Depending on what is on when and if two or more motors are running at the same time. This can as well have the opposite effect too, lights too bright.

Although loose connection can cause a problem and you should have all the connections checked, it could also be caused by several other reasons. You distance from and the load on the transformer, the size of you service conductors or lateral, the age and maintenance of your appliances. I have found out that light dimming happens in almost every house but some people are more sensitive to it than others.

Usually dimming of lights when an appliance kicks it is caused by a voltage drop of the supply caused by a heavy demand for current when the appliance initially starts. This is usually associated with an appliance that has a motor such as a refrigerator, furnace, washing machine, vacuum cleaner etc. Motors demand about 6 times their steady running current when they first start up and this can be a significant surge of current for maybe a half second or so till the motor has started and is up to speed. This basically momentarily 'overloads' the supply and lowers the voltage available to other devices, thereby causing them to momentarily slow down (if a motor) or dim (if it is a lamp).

If you switch to the new power saving compact spiral bulbs, their internal electronic ballast compensates somewhat for line voltage, so they won't react as noticeably to heavy loads starting up elsewhere in your house. The same is true for fluorescent tube fixtures with electronic ballasts.

One more point:If the lights are on a dimmer, they are very sensitive to change in voltage and will change their brightness disproportionately to the slight changes in voltage caused by motors or other heavier loads switching off and on.
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Home Electricity
Modification of Old Electrical Work
Electrical Troubleshooting

# Why would the electrical voltage in your house fluctuate?

for USA, Canada and countries using similar 60Hz household electricity supplies

First, get the circuits around the house tested to make sure it's happening everywhere.

You should call the power company to check the connections where your electrical service enters your house. (Meter base and breaker panel). It could be a loose connection. Do not check this yourself without getting it approved by the power company, and only if the service has been disconnected at the pole.

Removing their meter seal yourself can result in disconnection of service, fees, and criminal prosecution for theft of service. Also, it's much safer to let them check it, since they are qualified professionals.

The amperages in a service conductor can burn you to death if they are accidentally shorted, even momentarily. Electric arc flash can reach 30,000 degrees F.

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Call the utility company to check the supply to the house. If it is ok to the meter base and breaker panel, your house wiring is to blame

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Ask the utility company to feel the transformer wiring connections. They can be extremely hot because of corrosion and this will cause flickering power sometimes.

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Check the circuit breakers.

I had a friend who's lights were flickering. He had several people look into it. Electrician, Utility etc. No luck. We spent some time turning off breakers and we came to the realization that the circuit breaker's contact was bad. Replaced the breaker and voila no flicker.

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Troubleshooting is the height of the electrician's art.

The only reason there is "not enough voltage" somewhere is because there is a partially open connection providing resistance and a location to allow a voltage drop [bad splice, bad switch, bad breaker, broken wire, burned splice, ...].

It is the knowledge of how electricity works, and of the methods and materials used to create a functional wiring system, that enables a skilled troubleshooter to locate the problem and repair it.

Where should the "voltage" be, and how does it get there?

When you understand that, you will understand what is keeping it from getting where it should be...

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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.

Service Voltage fluctuation may be a Power Quality problem for your electric utility to review and correct. There are some items for you to go over and help narrow the source of the anomaly. First take the middle of the road, average service composition; it is a 200 Amp, 240 Volt, 3-Wire service. Your service may not fit this description to a tee for the following reasons:

• Maybe you live on a trailer park and your home is equipped with a 30 Amp service
• Maybe your home is far away from the service transformer
• Maybe only the lights, installed on the same breaker, experience the fluctuations
• Maybe nearby commerce or industrial users are causing voltage sags
• Maybe the problem was always there, but your new equipment does not work

As already suggested, find out if the problem is in one circuit (breaker), the service panel, or the service drop.

• A problem in a circuit breaker can be isolated by noticing voltage only fluctuates there
• A problem service panel problem can be isolated by voltage sags on all circuits
• A problem in the service drop can be identified if your neighbors also have the voltage sags
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Television and Video
Cameras
Photography
Electrical Troubleshooting

# Can anyone locate wiring schematic for 47546 security tv camera?

Can anyone locate wiring schematic for 47546 security tv camera?

White=ground

Yellow=Audio Tip

Blue=Video Tip

Orange=V+ (7.5vdc)

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WW1 Allied Forces
Central Powers
Dwarf Planet Pluto
Electrical Troubleshooting

# Why would there be no power to a switch?

The upstream supply has been interrupted.

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Ford Bronco XLT
Home Electricity
Electrical Troubleshooting

# Why does one bulb in a fixture blow out?

One possible reason is arcing inside the lamp socket. Loose bulbs can arc inside the socket. One sure sign of arcing is if the light "flickers" when it is on. Take the bulb out of the fixture and examine the contacts on the base. If any part of the base appears burned, there is arcing inside the socket. Arcing can cause a bulb to blow prematurely. Make sure the bulb is tight when istalling a new one. The best cure is to replace either the socket if it's removable, or the whole fixture if it's not. Also if it's an enclosed fixture, the heat from the light bulb can get trapped inside, causing the bulb to overheat, thereby causing it to fail prematurely. This is likely if you have too large a light bulb in the fixture, i.e. using a 100 watt bulb in a fixture designed for a 60 watt bulb. Try a lower wattage bulb.

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Home Electricity
Electrical Troubleshooting

# Why would lights and TV come on without anyone flipping the switch?

Having the surge protector should not affect individual circuits. It sounds more like to me you have a bad neutral somewhere. By that I mean a wire is loose. So say the light switch or TV is left on and the bad connection is currently open, neither work. So the wind or gremlins in your house do their work and the next thing you know their on because the circuit is now making through this poor connection. If this is the case, this is a bad deal ok. You should have this looked at by a qualified electrician. Now, there is something else it could be, it's called a switch feeder. It could be that somewhere else one of the kids turned on a light switch and poof, other stuff turns on. If this is the case, it's simply a matter of moving a wire from the switched side of the offending switch to the fed side. You can test this by making sure the light you want to come on is in the on position and then walking around the adjacent rooms and flicking on switches. You know, if the boys loosed some neutrals at your panel board when they were trying to find a spot for their surge protector, that would be the bad neutral I was talking about. If you just recently had it done, call them back and tell them what's going on. It will be as simple as removing the panel cover, re-tightening the screws on all the whites. You can do it yourself if you're brave. Just turn off the main and carefully tighten only the screws on the neutral/white bar. There are still places in a de-energized panel that can beat up on you, becareful and good luck.

Andy

AnswerWe had a similar problem several years ago. When we called an electrician to trouble shoot for us we found out that some of our aged "Aluminum wiring" was loose at the panel box internal connections.Some of the connections were dark with evidence of melting & burning. Very Dangerous !! Apparently when aluminum heats up it will shut-off the power, after it cools the power is restored..therefore some lights an the TV were turning off & on on their own.. A sign that there was trouble brewing. We had the electrical panel upgraded & replaced. Eventually over the past few years, we had all the aluminum removed and replaced with copper wiring. No further problems.
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Consumer Electronics
Home Electricity
Electrical Troubleshooting

# Why would the electricity shut off when you plug in another appliance?

Heaters use a lot of power and can easily exceed the capacity of an already loaded circuit. Anything with a motor or fan will use more power when starting up than after it is already running. If the circuit breaker or fuse is tripping when you plug in or turn on the heater, then you may have too many things on that circuit. Look at every electrical device on the circuit and add up the total watts of each one (it's listed somewhere on each, usually the back or bottom). Divide the total wattage by 120 to get the total amperage needed on that circuit. The fuse or circuit breaker should be rated for at least as many amps needed or it will trip when the total is exceeded. You may have to find another place to plug the heater in or have a circuit added to handle the extra load.

DON'T replace the fuse or circuit breaker with one rated for a higher load, the wiring may not be able to handle it and you could start a fire within the walls or attic. (Using extension cords for heaters in a house is a bad idea because the cord can overheat and start a fire.) If you aren't comfortable with this, find someone that knows what they are doing or hire a licensed electrician.

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Home Electricity
Electrical Troubleshooting

# Can you plug 240 appliance into a 110 volt outlet?

No, of course not. A 240 V appliance needs 240 volts to operate. Besides the plugs, male and female are completely different configurations.

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Pool Heating
Home Appliances
Electrical Troubleshooting

# What could be the problem with a Teledyne-Laars pool heater if the pilot light lights with no problem and the valve is ON but the burner will not start up?

On the inside of the heater cover, and within the documentation shipped with the heater, there should be a diagram of the control circuit. These heaters will not operate if the pump is off (pressure switch), if the "fireman" switch is off (a switch generally inside the pump timer that disables the heater about 15 minutes prior to turning off the pump), nor if both of two additional high temperature limit switches are activated (models will vary). The fact that the pilot is lit indicates that the pilot generator is OK. If you can turn the burner on by shorting the control circuit manually (using a jumper wire) the problem is in on of the safety limit switches, or in the thermostat itself. Good Hunting!

http://www.poolcenter.com/parts_heaters_laars_xe_pg1.htm

A pilot generator may have enough power to operate the pilot ,however not be sufficient to operate the main valve as well, this is quite common.

The way I test a millivolt system of any type is I have a AA battery holder from RadioShack with a positive and negative lead, I disconnect the pilot generators 2 leads and replace them with the AA batterys. The battery is 1.5v it wont hurt though, but if the gas valve wont open and you do get voltage to the gas valve terminals for the main valve, the valve is either bad or stuck, an amp draw will tell you if its trying to work or shorted perhaps if excessive.

There are a limit and on off and thermostat on this unit I believe as well .

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Electrical Troubleshooting

# Why do lights get brighter before they burn out?

When the tungsten in the lightbulb filament reaches the point where it cannot handle the current anymore, because too much of it has vaporized off, it momentarily has a higher amount of current go through it, just before it separates (burns out). From many hours of giving a steady glow, it dies in a last burst of energy flowing through it - more energy than it can handle.

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Electrical Engineering
Electrical Troubleshooting