electrialstandards

This Arduino project help you to control brightness of a 220V dimmable lamp or speed of ceiling fan (or any other electric motor) with an IR remote control using Arduino. Max. power which can controlled with this dimmer depend on triac model.(BT136 can bear 4A according to Datasheet). This project consist of 4 basic parts: 1-Microcontroller(Arduino) 2-Zero-cross detector(Bridge and Optocoupler) 3-Display(7Segment) 4-Phase angel controller(Tiac and Triac driver) The load can controlled by Up and Down bush button or with IR remote controller.  Circuit diagram:   Parts list: Arduino UNO(or other version) Optocoupler pc817 Triac driver MOC3021(Or any other Random-phase triac driver) 1 Digit 7 Segment common cathode Triac BT136 Diode bridge(4pcs 1N4007) Push bottom(4pcs) Resistor 100K(2pcs) Resistor470 ohm (2pcs) Resistor 330 ohm Resistor 100 ohm 1W Resistor 10K Capacitor 100nF 400v IR receiver 1830B Important NOTES: 1- You have to using only RANDOM-phase triac driver such as MOC ...

Circuit Breakers Utilization Categories:- The utilization category of a circuit-breaker shall be stated with reference to whether or not it is specifically intended for selectivity by means of an intentional time delay with respect to other circuit-breakers in series on the load side, under short-circuit conditions , Attention is drawn to the differences of the tests applying to the two utilization categories There are following types of utilization categories in Circuit breakers:- (i)             Category A These types of Circuit-breakers not specifically intended for selectivity under short- circuit conditions with respect to other short-circuit protective devices in series on the load side, i.e. without an intentional short-time delay provided for selectivity under short-circuit conditions, and therefore without a short-time withstand current rating. (ii)           Category B Circuit-b...

Rated short-circuit making capacity (Icm) The rated short-circuit making capacity of a circuit-breaker is the value of short-circuit capacity assigned to that circuit-breaker by the manufacturer for the rated operational making voltage at rated frequency and at a specified power factor for A.C., or time constant for D.C. It is expressed as the maximum prospective peak current. For a c the rated short-circuit making capacity of a circuit-breaker shall be not less than its rated ultimate short-circuit breaking capacity, multiplied by the factor n of table as below  . For d c the rated short-circuit making capacity of a circuit-breaker shall be not less than its rated ultimate short-circuit breaking capacity. A rated short-circuit making capacity implies that the circuit-breaker shall be able to make the current corresponding to that rated capacity at the appropriate applied voltage related to the rated operational voltage. Rated short-circuit breaking capacities In case of circuit br...