Most European countries are based on a 50Hz frequency. The electrical "grid" in North America is based on a very stable 60Hz frequency. The more cycles per second, the higher the frequency. The number of times this value changes (or cycles) per second is it's frequency. AC or alternating current is an electric current or voltage that reverses its direction of flow at regular intervals and has alternately positive and negative values, the average value of which over a period of time is zero. Typical Carling Technologies' switch rating:Ĭarling offers both AC (alternating current) and DC (direct current) switch voltage ratings. The switch in the example below would be rated for use with a 3/4HP motor at 125 through 250 volts AC. An AC motor will draw up to eight times its running current when first turned on or when held stationary while energized (stalled rotor). This rating reflects the amount of current the switch contacts can handle at the moment the device is turned on. Switches that are going to be subjected to high-inrush inductive loads, such as an AC motor, will often be rated in horsepower in addition to volts and amps. So, in the example below the maximum amp rating for this switch at 250 volts AC (VAC) is 10 amps the maximum amp rating at 125 volts AC for the same switch is 15 amps. The amp rating of a Carling switch is the maximum current in amperes the switch will carry continuously. The voltage rating specified on Carling Technologies' switches represents the maximum voltage allowable for the switch to function properly at the rated current. The voltage rating is a function of a switch's ability to suppress the internal arc that occurs when a switch's contacts open. One horsepower (1HP) is also equal to 746 watts of electrical power. Motors are rated in horsepower (HP) or fractions of horsepower (1/4, 1/3, 1/2, etc.) Mechanically, one horsepower (1HP) is equal to 33,000 pounds being moved 1 foot in 1 minute (or 33,000ft-lb/min). Voltage is also called electrical potential, because if voltage is present in a conductor, there is potential for current flow. Voltage itself does not flow through conductors, but is the force that causes current to flow. The electrical pressure necessary to cause this movement is voltage. The flow of electrons through an electrical conductor is called electrical current, which is measured in amperes or amps. ![]() Carling Technologies switch ratings are listed by amperes, volts, and horsepower (when applicable).Įlectricity is the movement of electrons from one atom to another. Enter any two values, then click or tap "Calculate"ģ-Phase KVA = Volts x Amps x 1.732 / 1000ģ-Phase Amps = KVA / Volts / 1.Any Carling Technologies' switch that has agency approvals will have its ratings stamped on its base. ![]() NOTE: If you need assistance with circuit protection devices such as fuses or breakers, or wire sizing, please consult a licensed electrical contractor or electrician in your area who will be familiar with state and local codes.Īll information obtained while using this calculator should be confirmed by a qualified electrical contractor or engineer.Ģ. All values should be reviewed and confirmed by an electrician or electrical engineer. When the KVA rating has been calculated, divide that number by 0.8 to get the minimum KVA rating needed. ![]()
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