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The NEC requires that if the intended rating of a circuit corresponds to a standard size breaker then that size breaker must be used. In most instances, "rating of a circuit" means the intended connected load plus 25%.
If the intended rating of a circuit does not correspond to a standard size breaker, you can go up to the next standard size without any other adjustments.
In most circumstances, besides what I've already stated, a 14 gauge copper wire cannot be connected to a breaker larger than 15 amps, 12 gauge copper to a 20 amp breaker, and 10 gauge copper to a 30 amp breaker.
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What are the safety devices utilized in Air Circuit Breakers?
closing coil 24 vdc
Will GE breakers fit a Murray panel?
No, they will not work. Use only Murray breakers for safety.
What is the name of a safety device that will shut off flow of electricity?
Devices used to open an electrical circuit are called OCPD's. (overcurrent protection devices) The most common are circuit breakers and fuses. In commercial motor starters they often employ another OCPD called a "heater" (UK thermal fuse) which is a metal strip which melts like the element in a small fuse when too much current (amps) go through it. They devices are in the circuit primarily to protect the wiring and devices they power. Circuit breakers such as in your home panel do protect you from a "shorted" circuit. Another safety and most common in residences are GFCI's or ground fault circuit interrupters (UK ELCB, Earth Leakage Circuit Breaker or RCD, Residual Current Detector) which come as both a receptacle (female plug) or as a circuit breaker.
Why clipping should be accounted for in designing amplifier circuit?
A: If an amplifier can be subjected to either input or output overdrive then clipping of both is desirable to insure safety margin and insure amplifier recovery in a minimum time
What are the safety features available in a breaker?
To detect and open the circuit if a thermal overload is present and to detect and open the circuit if a short circuit caused by a magnetic increase of flux in the circuit.
What are the safety devices utilized in Air Circuit Breakers?
closing coil 24 vdc
What is margin of safety ratio?
Margin of safety ratio = margin of safety/sales revenue
What should be kept handy in case of there is a short circuit?
A safety obeserver who has a wooden object to pull you from the live circuit. They must be trained in CPR and know where the circuit breakers are to deactivate the dangerous circuit in case of a mishap.
Profit margin formula?
Contribution of margin safety x margin of safety
Why do some circuits have breakers?
They are a safety mechanism designed to open or break the circuit in the case of overload. They are usually used when a device on the circuit would be damaged or destroyed by an overload.
What safety features are built into a home?
Safety features built into a home include: * circuit breakers and ground fault circuit interrupters * electrical wiring installed to code * grounded water distribution piping * smoke detectors
Why are fuse boxes or curcuit breakers good safety features in houses?
They can avert electrical fires in case of fuse boxes and many modern circuit breakers can stop people from being seriously electrocuted
Can home circuits have safety devices called fuses and circuit breakers that close a circuit when too much current passes through?
The safety devices does not close, but opens the circuit. Homes in the United States must have circuit current protection in order to meet building code requirements. They can use fuses or the push-in circuit breakers. In order for amperage to flow through them, they must be closed, which provides a continuous flow of current from the source to the load. If too much amperage passes through, the fuse blows or the circuit breaker opens, creating an open circuit that stops the flow of electricity.
What are fuses and circuit breakers What are they for?
A fuse is a device that contain a thin strip of metal that will melt if there is too much current through it.A circuit breaker is a reusable safety switch that breaks the circuit when the current gets too high.They are used to prevent circuits from overheating.
Will GE breakers fit a Murray panel?
No, they will not work. Use only Murray breakers for safety.
What is the different high voltage equipment in the substation?
In a substation there are many items. Circuit Breakers Disconnectors Earth Switches Current Transformers Voltage Transformers Surge Arrestors Power Transformers Insulators
If Hartman Co has fixed costs of 36000 and a contribution margin ration of 24 percent If expected sales are 200000 what is the margin of safety as a percent to sale?
First you need to find the break even sales. Break even sales = fixed expenses/ CM ratio Break even sales = 3600/.24 = 15,000 Then find the margin of safety dollars. margin of safety dollars = budgeted sales - break even sales margin of satefy dollars = 200,000 - 15,000 = 185,000 Then you can find the margin of safety percent Margin of safety percent = margin of safety dollars/ budgeted sales dollars margin of safey percent = 185,000/200,000 = 92.5%
