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Fuse sizing is calculated by the size of the conductor. The conductor is calculated by the amperage to the load.
The above answer is partially right, however in calculating fuse sizes for say a motor load of 10 hp on 208 volts 3 phase. The table in 430.250 list this motor as pulling 30.8 amps. Conductor size would be 30.8 times 1.25 or 38.5 amps. This value would lead you to wire table 310.15(B)(16) and a conductor size of number 8THWN. This conductor is listed for 50 ampacity, however due to the starting current of the motor. A fuse could be sized at 30.8 times 1.75 or 53.9 amps. The next standard size would be 60 amps. the fuse size is above what the conductor is rated for, but because of motor overload protection the conductor is protected. If breakers were used instead of fuses, a breaker would be sized at 30.8 times 2.5 or 77 amps or 80 amp next standard size.
What else can I help you with?
What is MSB in electrical wiring?
MSB stands for Main Switchboard. It is a panel that serves as the primary distribution point for electrical power in a building or facility. It typically contains main circuit breakers and is where all incoming electrical power is distributed to various circuits.
How is godown wiring different from hostel wiring?
Godown wiring refers to the electrical wiring system in a storage facility typically designed for efficient lighting and power supply to large spaces. Hostel wiring refers to the electrical wiring system in a residential building that accommodates multiple occupants, with individual rooms or living units having their own wiring for lighting, power outlets, and other electrical needs. The main difference lies in the scale and complexity of the wiring design to suit the specific usage requirements of each type of building.
What are mains sockets?
Mains sockets are electrical outlets designed to connect devices to the power supply. They provide access to electricity for devices such as lamps, appliances, and chargers. Mains sockets are typically found in homes, offices, and public spaces for powering various electrical devices.
What color is the neutral lead?
In electrical wiring, the neutral lead is typically color-coded as white or gray. It is used to carry current back from electrical devices to the main power source.
Which type of Electrical wiring is used in your homes and offices?
Parallel for main circuits and series parallel for lighting circuits.
What are practical uses of copper?
The main use is in electrical wiring.
What does the 75A battery fuse on a 96 Nissan altima control?
That is the main fuse. It protect all the wiring in the vehicle.
What is the purpose of a ring main circuit in electrical wiring systems?
The purpose of a ring main circuit in electrical wiring systems is to provide a continuous loop of wiring that allows electricity to flow in both directions, ensuring a more balanced distribution of power and reducing the risk of overload or voltage drop.
Why does the main fuse on your Mazda bongo keep blowing?
More than likely a short in the wiring.
Is there a main fuse in a Hyundai Elantra?
Yes, a main fuse is located in the Hyundai Elantra engine bay fuse box. The main fuse is used for the alternator just in case the alternator experiences a power surge. It protect the rest of the electrical components.
Can a fuse stop a 1991 Honda Accord from starting?
Yes, a blown main fuse will cut all electrical power to the vehicle.
How does a automotive fuse box work?
It's a central location for all electronics essentially. The main design of a fuse box is to hold fuses in a central location and a good testing/ diagnosing point for electrical problems. So you won't be chasing fuses and wiring all around the vehicle everytime you diagnose it.
What is MSB in electrical wiring?
MSB stands for Main Switchboard. It is a panel that serves as the primary distribution point for electrical power in a building or facility. It typically contains main circuit breakers and is where all incoming electrical power is distributed to various circuits.
What could be the possible reasons for a power outage in half of the house?
Possible reasons for a power outage in half of a house could include a tripped circuit breaker, a blown fuse, a faulty electrical outlet, a problem with the electrical wiring, or an issue with the main electrical panel. It is important to troubleshoot and address the specific cause to restore power to the affected areas.
What are the different types of breaker boxes available for residential electrical systems?
The main types of breaker boxes for residential electrical systems are main breaker panels, subpanels, and fuse boxes. Main breaker panels are the primary electrical distribution point in a home, while subpanels are additional panels used to expand the number of circuits. Fuse boxes use fuses instead of circuit breakers to protect the electrical system.
Which IS a common sense safety procedure that can help prevent electrical accidents?
The main safety rule is to switch off at the mains before working on electrical equipment and wiring.
What are the main requirements for the house wiring?
SAFETY. Don't let any one that is not qualified to touch your home electrical system!
