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Electric energy used in homes is measured using a kilowatt hour meter. This is the meter that is found on the outside of your home just below where the utility company makes a connection to your house.
PLC or programmable logic controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly line, amusement rides, or lighting fixtures.
Current carrying capacity is different for aluminum from that of copper cable. Under different conditions like, type of insulation, number of conductors, in conduit, underground, in air, single or multilayer, system voltage, the current carrying capacity varies a bit. Hence You must refer a standard chart from a reputed cable company.
Nikola Tesla invented AC, probably a transformer as well but don't quote that.
As a rough estimate, for medium voltage cables directly buried in earth, I use 2 A / mm^2 for copper conductors, and 1.2 A/mm^2 for aluminum conductors.
However, the installed capacity of a cable is mostly dependent on how much heat can be dissipated to its surroundings, and ultimately the maximum temperature of the insulation material.
For this reason, it is important to know how the cable will be installed, what conductor is used (Al or Cu), the cable insulation (for both thickness and operating temperature limits), soil thermal resistance (if buried), and if there are other heat sources (cables, process pipes, incident solar radiation, etc) are nearby.
There are several cable manufacturers that provide reference current ratings for nominal installations. Check Nexans, Prysmian, or Okonite (US dimensions).
2.5 sqmm cu cable current carrying capacity is 19 amps.
Motor protection circuit breakers(MPCB) are a specialized type of electrical protection device that is designed specifically for electric motors, like their name implies. Electric motors have plenty of applications and are used to drive mechanical devices of all types, so it is very important to protect them adequately with MPCBs.
"Locked Rotor Current" also called LRA which stands for Locked Rotor Amps, is commonly found on electric motor nameplates. Locked Rotor essentially means the motor is not turning. The current or amps in this case have to do with the amount of electrical energy required to start the motor. At the instant the motor is switched on, it is not turning, and draws the maximum current. As the motor starts to turn, the current goes down. This required energy is much greater than the Full Load Amps or Running Amps, which is the current drawn when the motor is running at normal speed under full load. The current required to start the motor will depend on the type of motor as well as the specified design voltage required for the motor, typically the higher the voltage, the lower the required amperage or current.
The term also applies to equipment such as Air Conditioners which have an enclosed motor inside the compressor, as well as the condenser fan(s) etc.
Depending on the type of motor, LR current can be anywhere from 3 to 8 times the normal running current, also called RLA, or running load amps.
No, a circuit box is just a metal or plastic box that encloses the wiring and has means for mounting a cover plate. Most circuit boxes are for mounting outlets or switches, but one type (also called the junction box) is only intended as a junction point for wiring for multiple circuits and its cover plate is solid (no openings).
The wires that pass through a circuit box (usually together in a common plastic jacket) will be identified as:
By rule of thumb, the neutral conductor is half the size of main conductor.
The equation that you are looking for is I = E/R. Amps = 120/20 = 6 amps. This is one of the basic equations of Ohm's Law.
Mains electricity is nothing but main source of power in an installation. From the mains the power is then branched out to different end usage.
The current draw is about 27 amps. A motor feeder has to be 125% of the motors full load amperage. 27 x 125% = 33 amps. A #8 copper conductor with an insulation factor of 90 degrees C is rated at 40 amps.
It usually refers to portable or mobile equipment that can be used on projects that are not associated with the buildings in which they are stored.
If it is a 32-amp circuit you can use any appliance that takes less than 32 amps. That includes a 15-amp appliance. All appliances fed from that circuit must use 32 amps or less in total.
Answer for UK, Europe and countries running a 50 Hz supply service.
A ring circuit has two routes to each outlet, a radial has only one.
An RCCB has 4 electrical connections.
If you look at the circuit picture of the device (usually on the front) you will see that these 4 connections are split into 2 live/hot connections and 2 neutral connections. Furthermore they are divided again so 1 live on top, 1 live on the bottom, and also 1 neutral on top 1 neutral on the bottom.
Electrically the device will function regardless of which side is used as the input.
Which side (top or bottom) you choose to supply the device from is up to you and usually decided by the ease of access to the terminals at the time of connection.
You may also consider from the point of using a busbar that it may be easier to mount the device on top of it (thereby feeding the device from the bottom), this is perfectly OK.
From a strictly technical standpoint the armature (the moving part) of a switch should not be live/hot if the switch is in the off position, however from a practical viewpoint (since the device works regardless of polarity) this is usually disregarded in lieu of mounting and wiring ease with respect to RCCBs, MCBs etc.
Summing up: As long as your supply cables (Live and neutral) are on one side (top or bottom) and your feed cables are on the other side you will not have any problems with the functioning of this device.
Lastly,
if in doubt, please contact an electrician.
A ceiling rose is the name given to an enclosed terminal block which enables a suspended lamp to be connected to a residence's permanent wiring. It also provides a means of gripping the flexible cable to support the weight of the light fitting.
Usually red is for positive and black is for negative.
Any equipment that is dependant upon frequency will be effected. Synchronous motors will slow down.