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Can essential circuit combine in one conduit with normal circuit?
Wiki User
∙ 12y ago
The use of the words "essential circuit" implies that you are refering to the requirements of the NFPA electrical standard, aka NEC, which is commonly enacted as law in many USA jurisdictions (but not everywhere).
The 2005 NEC discusses "essential circuits" as part of the Health Care Facilities, chapter #517
The "essential" system is subdivided into 2 subsystems:
EMERGENCY and EQUIPMENT
The EMERGENCY system is subdivided further into two sub-sub-systems:
LIFE SAFETY and CRITICAL
Sections 517.30-B and 517.30-C cover this topic
These sections require that the EQUIPMENT circuits not be mixed with the EMERGENCY circuits (either life safety or critical). EQUIPMENT circuits can be mixed with NORMAL circuits
The LIFE SAFETY and CRITICAL circuits also must be kept separate from each other and from NORMAL.
There are a few exceptions to the above basically relating to where different circuits meet at equipment
There is another related requirement that states the LIFE SAFETY and CRITICAL circuits must be in rigid metal raceways (no flex, no PVC). The equipment circuit does not have to be.
These are important distinctions. Please be certain to read and understand the code before proceeding.
Wiki User
∙ 12y ago
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What is the name of the device that protects a circuit from current overload?
It is called fuse or circuit breaker.In electronics and electrical engineering, a fuse is a type of low resistance resistor that acts as a sacrificial device to provide over-current protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Fuses are an alternative to circuit breakers.A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow.Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
How many ohms is a 120 volts?
"Volts" is electrical pressure applied to a circuit; whereas, "ohms" is electrical resistance to that pressure. One cannot determine ohms from voltage without knowing either the current (in "amps") or power (in "watts"). A normal 120V household circuit can handle a maximum of 20 amps, so using ohm's law of resistance = voltage / current, the minimum resistance required in a 120V household circuit would be 6 ohms. Any less than 6 ohms will cause the circuit breaker to trip.
How diodes protect the circuit from back emf which is generated by relay coils?
The relay coil is an inductor and, as such, resists a change in current. When you de-energize the coil, it attempts to maintain the current flow, but it cannot because you have opened the circuit. This causes a high voltage spike to be developed across the coil which is of opposite polarity to the normal current. The diode conducts, dissipating the current and preventing the voltage from exceeding the safe operating voltage of the driving circuit, often a transistor. The Diode is wired so that it is in reverse during normal operation, so no current passes through the diode and does not affect the coil it is parallel connected to.
Why have I always been told not to load up an electrical circuit or equipment more than 80 percent and where is this stated?
The 80% ideal is from the NEC. Let's say you have a standard 15A circuit. This circuit is rated to carry a maximum of 15A, no more. If you try to draw more than 15A, the breaker will pop. Now, you can put 15A worth of appliances on this circuit, but then you are running it at its maximum all the time. If you add anything else to this circuit, you will pop the breaker. If you have something that draws surge current, it can opo the breaker under normal use. You have no "wiggle room" when you load it at its maximum. Also, as touched on above, if you run your circuit at the maximum you cannot add anything else. This is generally a sign that you need to upgrade your wiring. Furthermore, the breaker can handle 15A indefinitly under standard test conditions, which are close to ideal. Your breaker box may not be ideal. Breakers are thermal devices, so self heating and heating from other breakers can be a problem. If your breaker is hot, it will pop sooner than if it is cold. The more current that flows through it, the hotter it will get. If you are overloading circuits the easiest thing to do is to break the circuit up into multiple circuits. The exact implementation will depend on the situation.
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A ground wire is normal.
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Abraham Lincoln preferred them to perpendicular circuits.
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Essential Fat
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A resistor in a sensor circuit is used as a simple way to monitor the function of the circuit. The resistor has a calibrated and known voltage drop and current while the circuit is "normal". If there is a short-circuit, or an open-circuit, the voltage and current will change and trigger the trouble alarm.
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What is the name of the device that protects a circuit from current overload?
It is called fuse or circuit breaker.In electronics and electrical engineering, a fuse is a type of low resistance resistor that acts as a sacrificial device to provide over-current protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Fuses are an alternative to circuit breakers.A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow.Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
