0
How is the rating of the branch circuit protective device affected when conductors used are of larger size than called for by the code?
There is no problem using over sized wires on a breaker. It is only when the wires are undersized that the trouble begins. Oversize wire on a breaker is very common practice when overcoming voltage drop on a circuit.
What else can I help you with?
What are all of the conductors between the service equipment and the final branch circuit?
The conductors between the service equipment and the final branch circuit include service conductors, feeder conductors, and branch circuit conductors. Service conductors connect the utility service to the service equipment. Feeder conductors distribute power from the service equipment to the panelboard or distribution board. Branch circuit conductors then carry power from the panelboard to individual outlets, fixtures, and appliances.
How is the rating of the branch-circuit protective device affected when conductors used are of a larger size than called for by the code?
The branch circuit circuit breaker or fuse protects the wire and devices that make up the circuit. If you have a 15 A breaker the wire size must be at least 14 AWG. You could have a larger wire size like 12 AWG, but not a smaller size like 18 AWG. Note as the number decrease the wire size is larger in cross sectional area. All the receptacles and switches should be rated equal to or greater than the branch protection device.
What causes the main breaker to trip from a fault current from a twenty amp branch circuit?
A fault current on a twenty amp branch circuit can cause the main breaker to trip due to the higher-than-normal flow of electricity, which exceeds the circuit's capacity. This could be caused by a short circuit (abnormal connection between conductors) or a ground fault (unintended connection between a conductor and ground). The main breaker detects this overload and trips to prevent overheating and potential fire hazards.
What article in the NEC tells you what size breaker is used for 14awg 120v receptacle?
The article designations may change with the code cycle year. In the 2005 NEC see table 310-16 (allowable ampacities for conductors), also article 240.4(D) (protection of small conductors), also table 210.24 (summary of branch circuit requirements for muti-outlet branch circuits)
What type of an electrical circuit has more than one current branch?
A parallel circuit has more than one current branch. In a parallel circuit, the components are connected in separate paths to the voltage source, allowing for multiple current paths and different current levels through each branch.
What are all of the conductors between the service equipment and the final branch circuit?
The conductors between the service equipment and the final branch circuit include service conductors, feeder conductors, and branch circuit conductors. Service conductors connect the utility service to the service equipment. Feeder conductors distribute power from the service equipment to the panelboard or distribution board. Branch circuit conductors then carry power from the panelboard to individual outlets, fixtures, and appliances.
How is the rating of the branch-circuit protective device affected when the conductors used are of larger size than called for by the code?
There is no problem using over sized wires on a breaker. It is only when the wires are undersized that the trouble begins. Oversize wire on a breaker is very common practice when overcoming voltage drop on a circuit.
How is the rating of the branch-circuit protective device affected when conductors used are of a larger size than called for by the code?
The branch circuit circuit breaker or fuse protects the wire and devices that make up the circuit. If you have a 15 A breaker the wire size must be at least 14 AWG. You could have a larger wire size like 12 AWG, but not a smaller size like 18 AWG. Note as the number decrease the wire size is larger in cross sectional area. All the receptacles and switches should be rated equal to or greater than the branch protection device.
DoesCode permit connecting receptacles to a 20ampere branch circuit using short lengths of 14AWG conductors as the pigtail between the receptacle terminals and the 12AWG branch-circuit conductors?
No. This practice is a violation of Article 210.19 (A) of the NEC. "Conductors of branch circuits supplying more than one receptacle for cord-and-plug-connected portable loads shall have an ampacity of not less than the rating of the branch circuit."
What is multiwire branch circuit?
A multiwire branch circuit is consist`of two or more ungrouded conductors that has voltage between them and has a grounded conductor that is eoual voltage between each conductor connect to the neutral and it,s ground
What is a feeder circuit?
Definition from the National Electrical Code Article 100:Feeder. All circuit conductors between the service equipment, the source of a separately derived system, or other power supply and the final branch-circuit overcurrent device.Branch Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
Can you use a transformer to compensate the voltage drop in a branch circuit?
If the voltage drop is excessive, it is a sign that the circuit conductors may be undersized. Better to install larger conductors. If you try to use a transformer, under light loads the voltage will rise to unacceptable levels, possibly damaging equipment.
How is the rating of the branch-circuit protective device effected when the conductors used are of a larger size?
Current has a tendency to pass through the path of least resistance. If there are multiple paths in which protective devices are provided, protective devices respond differently since the current in the different paths could be different. larger size conductor offers less resistance, hence the path that has larger size conductor may carry larger current than other path.
What is the result when a branch of a parallel circuit has an open circuit?
When a branch of a parallel circuit has an open circuit, it breaks the loop and prevents current from flowing through that particular branch. The other branches of the parallel circuit will continue to operate as normal, as they are unaffected by the open circuit in the specific branch.
What causes the main breaker to trip from a fault current from a twenty amp branch circuit?
A fault current on a twenty amp branch circuit can cause the main breaker to trip due to the higher-than-normal flow of electricity, which exceeds the circuit's capacity. This could be caused by a short circuit (abnormal connection between conductors) or a ground fault (unintended connection between a conductor and ground). The main breaker detects this overload and trips to prevent overheating and potential fire hazards.
What ampacity should branch circuit conductors have?
Branch circuits wire sizes are governed by the connected load amperage of the circuit. The wire size ampacity then governs the size of the breaker that is used to protect the circuit from overloading. For general home wiring circuits the conductors used are, receptacles and lighting #14 - 15 amps, dedicated circuits load dependant, hot water tank and baseboard heaters #12 - 20 amps, clothes dryer #10 - 30 amps, range #8 -- 40 amps.
Does the code permit the ampacity of switch legs to be less than the ampere rating of the branch circuit?
No, and here's why: the rating of the branch, determined by the overcurrent protection, is designed for the ampacity of the branch conductors so that they breaker trips before the conductors heat up enough to start a fire. If you put in smaller wires on the same branch, they will get MUCH hotter before the circuit breaker trips, if it ever does. For example, a 20A branch, protecting 12AWG wiring; add some 14 AWG rated for 15A. Something faults the switched leg at 18A; enough to burn out the wiring but not enough to trip the breaker. House burns down, insurance doesn't pay because of "faulty wiring" installed negligently by a person without proper training and credentials.
