Electrical Troubleshooting

LRA stands for locked rotor amps. It is the very high current drawn by a motor at the instant it receives power, but before the motor has started to turn.

Typical LRA values can be anywhere between 3 and 8 times the full-load running current.

A Multimeter is an electronic instrument, every electronic technician and engineer’s widely used piece of test equipment. A multimeter is mainly used to measure the three basic electrical characteristics of voltage, current, and resistance.

There are two types of multimeters:

Analog Multimeter: The Analog Multimeter or VOM (Volt-Ohm-Milliammeter) is constructed using a moving coil meter and a pointer to indicate the reading on the scale.

Digital Multimeter: We mostly used a multimeter is a digital multimeter (DMM). The DMM performs all functions from AC to DC other than analog. It has two probes positive and negative indicated with black and red color as shown in the figure.

there are some best multimeters for HVAC.

If the power strip has an indicator light it uses a very minimal amount of power, especially if it's a neon or LED indicator. If the power strip uses either of those, the power use is effectively unmeasurable. Incandescent indicator lights use a very small amount of power.

But in reality, indicator lights are off when the power is off, so actually power strips use no power when they are off.

The answer depends entirely on the wattage of bulb used! You can find the amperage of your light by using the Power Law which states that amperage = wattage divided by voltage. Thus a 60 watt bulb on a 120 volt system would draw .5 or 1/2 an amp.

It sounds like you are describing either a slimline or dc recessed base type of fluorescent fixture. There is a wiring diagram on the ballast of both of these types of fixtures. Do your wiring the same as what is shown and you will have no problem.

find an operator and try to find some answers as to what the machine is actually doing

it is not wise to remove this device it is in place for your safety it is also wise to note over time these device do false trip for no reason.Some will trip with an induction load like a fridge . have it tested .........................

Don't know what you mean by back wire, but most GFCI outlets have a circuit to attach additional outlets that will be protected by the GFCI. Keep total load in minds.

The wiring in a building, is designed to take the current to devices, when working properly. If a device develops a short circuit, the current is massive and unlimited.

Passing massive amounts of current through thin cables will make them heat up, just like the filament in a lamp. This will cause a fire.

A fuse is simply a thin wire, that is designed to burn up, when too much current flows through it. It is a controlled burn, inside a specially designed container, at a specific location. As the fuse is in the supply line, when it breaks, the power is also broken and everything returns to a safe situation.

A breaker uses a bi-metal strip or coil to monitor the current and tip a switch when too much current flows. Breakers however can be reset and not normally destroyed by a fault.

An adapter is needed to use a North American shaver in Europe. European outlets are a different size along with a different voltage that you shaver is rated for. An Adapter will take care of both of these problems.

It has momentum and the rotor is free to keep turning in the motor. It slows gradually due to friction of the rotor and the blades moving through air. If there were no friction it would never stop. The bad part is that there would be no air either so you wouldn't care.

Usually electronics will operate at higher or lower voltages. You could use 3 1.1/2 volt batteries for a total 4.5 volts or 4- 1.12 volt batteries for a total 6.0 volts. The former is safer and won't let the smoke out. The device probably will operate at 6.0 volts instead of 5.0v OK but if you let the smoke out, it will never work again as all electronic equipment relies on the smoke inside to work properly. You let it out and it never works again

You can check the input and output in PLC by using the force command. Through the programming instrument the input can be forced opened or forced closed depending on what the status of the contacts are set to. This can also be done with the output contacts.

Yes but you need a attentuator to cut signal down to input levels. You can get them at radio shack.

When flexible cords are talked about the ground wire is in the conductor count. A four wire cord will have black, red, white, and green coloured wires in the flexible cable set. A three wire cord will have a black, white and green coloured wires in the cable set. To use a four wire cord to carry 220 volts just use the black, red and green wires. Connect to the cord ends. Black and red to the outside blade terminal screws and the green wire to the green ground screw. To use a three wire cord to carry 220 volts just use all of the wires. Black and white to the outside blade terminal screws and the green wire to the green ground screw.

If a cable insulation is described as RHW, you would be able to use the cable for what maximum temperature?

A. 194°FB. 140°FC. 86°FD. 167°F

Here are some places:(Add an "h" prior to the address when you copy and paste)

ttp://hsinchang.gmc.globalmarket.com/products/details/transformer-101798.html

ttp://www.unelco.dk/files/pdf/UNELCO_Katalog_2.pdf

ttp://www.eckind.com/product_2615500_150w-12v-ce-cb.htm

To inhibit is to "prevent or stop something from happening".

Dielectric grease would be a better choice.

The load is essentially what consumes electrons. For example a load on a light circuit would be a bulb. Therefore, if you don't hook up a load you aren't doing anything. It is like turning on a light switch without a bulb. It may give you some minor exercise, but it doesn't do anything useful.

Usually in a 230 volt situation, there are three wires. One wire is called neutral or ground. When you hook a motor or lamp between one wire and neutral, you get 115 volts. They are designated usually as L1, L2 and neutral. Things hooked between L1 and L2 are at 230 volts. Anything between L1 and neutral or L2 and neutral are at 120 volts.

If you're really lucky, you'll just have no power going to the light. You could very easily short out across the circuit breaker. Dimmers are not intended to be used in series, which would be the only way to hook them up in place of 3-way switches.

This does not apply if you can find 3-way dimmer switches. They are expensive and fairly uncommon, but there are a few out there.

It's always best to have any electrical work performed by a licensed, bonded electrician.

The voltage 277 volts is a three phase line to neutral voltage of a 480 volt system. What is needed for the protection of the transformer is a two pole breaker from the 480 volt CDP (Central Distribution Panel). The breaker will be sized to the KVA of the transformer. The wire will be sized to the breaker plus 25%. The electrical code requires that on motor and transformer feeders, they be sized to 125% of the total current capacity of the equipment.

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.