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How do you calculate the power for an overhead crane to size the cable and breaker disconnect switch?
Wiki User
∙ 15y ago
If you really have an overhead crane to install it would also be likely that you would either know how to do the installation already or would know that such work should only be done by a licensed electrician... <><><> It would be easier to give you a more helpful answer than this one if you had described the crane and the size of its motors. You need to give such basic details as the output horsepower of the electric motors used to turn the crane and lift the load, their operating voltages and current consumptions... <><><> This seems like a question from an electrical course, and is probably best answered by referring to your course materials. It's your test question, not ours, and there won't always be someone else to ask for the answer. Earn your diploma.
Wiki User
∙ 15y ago
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What is the Limit switches working principle?
Limit switch is one type Of " Contact Sensor" , In that there is Normally Open Contact & Normally Close Contact, In limit switch there is Plunger it is Directly Connected to NO & NC Contact if we press the plunger NO contact become NC & NC contact become NO, Working Principle same as Contactor ( DOL starter ) main difference is in contactor There is Coil to attract the Plunger But In Limit Swict Plunger is Operated Mecanically.Limit Switches is used mainly for Safety Purpose & to take Feed back for PLC in Automation industries........Source(s):In My Plant I have installed limit Switches.. A limit switch is a switch, usually mechanical, that is actuated by a moving part of some machine. Its operation is much like any other switch in that there are contacts that move when a plunger or lever on the outside of the switch is pushed. Internally there is an over center spring mechanism that snaps the switch open or shut in response to a gradual motion of the plunger or lever.Many limit switches have three terminals. One is the normally closed contact, another the normally open contact, and the third is the common that switches between these two as the mechanism is moved.
How does an ejector pump work?
As the float rises it lifts an electric switch lever which energizes the pump to remove effluent. As the water level decreases the float weight puts a strain in the switch lever and the pump shuts off until the water level rises again
What is the role of a tamper switch on butterfly valve?
A tamper switch (in a burglar alarm system for example) is designed to stop un-authorised access to the inside of the control panel. It usually takes the form of a small micro-switch that activated when the cover is opened. Even if the alarm has been de-activated (by entering the correct code) the anti-tamper circuit is still active so long as there is power to the system. Cutting the lead to the external sounder, or the mains lead doesn't stop it either - there is usually an internal sounder, and a back-up battery.
What is the sequence of operations of gas furnaces?
Thermostat calls for heat. Induced draft fan motor starts. Vent pressure switch verifies pressure. Simultaneously gas valve opens and ignitor lights burner(ignition varies: hot surface ignitor, electronic spark ignitor, or standing pilot). Flame is sensed. High limit temperature switch is made. Blower fan runs. Thermostat calls for no heat. Gas valves close. Burners shut off. Induced draft fan shuts off. Blower fan put into fan delay(fan blower continues to run). Low limit temperature switch made. Fan blower stops.
How does an electromechanical relay work?
All electrical relays consist of two circuits. 1.. A control circuit that utilizes a control voltage with a minimum current to switch a 2.. Power circuit requiring much greater current. The advantage of using this type of circuitry is that the switches or sensors that control large loads can be very small, {i.e. pilot switches, limit switches, sensors, etc.}, since they are the control switching device that can be capable of switching loads up to 600 amperes. This arrangement allows a very small wire size for controlling large loads. Without the use of relays, switches that control larger loads would be very expensive and occupy much more space.
What is a non auto circuit breaker?
A non-auto circuit breaker is a circuit breaker with the trip element removed. Basically, it is a modified circuit breaker that is now a disconnect switch (glorified disconnect switch).
What is the difference between disconnect switch and circuit breaker?
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, by interrupting continuity, to immediately discontinue electrical flow.The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work to be done and to clear faults downstream.
Can a 220 Volt well motor be added to a 200 amp box or does it need its own box?
The well pump breaker is installed in two slots in your breaker box. You then run the correct size cable for the amperage of the pump to the area where the pressure tank is located. install a breaker or disconnect on the wall near the pressure tank and then connect the low pressure switch to the disconnect. Connect the pump to the low pressure switch.
What does the trip free characteristic of a circuit breaker mean?
A trip free circuit breaker is one that will disconnect a circuit even if the manual switch is held at the "on" position. It is a safety feature to prevent a circuit breaker being disabled either deliberately or accidentally.
Which is easier to use a fuse or a breaker switch?
A breaker switch is easier to use.
True or false A device that is used to open the circuit when the current flow is to great is a disconnect switch?
False. A device that is used to open the circuit when the current flow is too great is a circuit breaker or fuse.A disconnect switch is a manual device that isolates or turns off the load.
How do you keep your furnace off?
Turn the thermometer switch to offTurn the electrical service switch by the furnace to offTurn off the main breakerAfter turning off the main breaker disconnect the power line to the furnace
What rating is called for in a non fussed disconnect switch between a Automatic Transfer Switch with a 400amp breaker 120 208v system and a generator that outputs 120 208v 3ph capacity 100KW 125KVA?
400 amps
What breaker will interchange with American Switch Company?
Replacement for American Switch single pole 15 amp circuit breaker
Will turning off power to a ceiling fan via a wall switch be sufficient for installing a new fan or must the circuit breaker be off too?
In most cases the switch disconnect will do the job. It depends on the circuit wiring that the fan is connected to. If the circuit is a three wire circuit you could receive a shock when you open the neutral wire if you accidentally touch the neutral and the system ground at the same time. As an electrician we always take the safer road and disconnect the power supply from the load at the breaker and not depend on the switch for complete circuit isolation.
What circuit breaker will interchange with American Switch Company?
Replacement for American Switch single pole 15 amp circuit breaker
Can you get electrocuted if the switch is off but the breaker is on?
Yes you can. The proper wiring of a switch is to bring the hot wire to the top of the switch terminal and connect the load to the bottom of the switch. When the breaker is turned off it disconnects the voltage from the top of the switch and the switch is then safe to work on. By not turning the breaker off, the voltage is present at the top of the switch which could subject you to a nasty shock if you come into contact with it.
