Voltage drop=(voltage drop ampere/meter) x length x current. Once you get all the above data, the voltage drop can be calculated as follows.
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Voltage drop Ampere/Meter which you will get from the cable supplier (in mV).Length of the cable from the starting end to receiving end.For the time being you can assume the standard cable size corresponding to your switchgear rating and as per your authority standards.Once you know how much current the cable is gonna carry you can easily finalize the rating of protection device ( ACB, MCCB, etc.,).(To be on a safer side you can assume 2 times the load in kW or else you can apply the formula for power to get the exact current) Corresponding current for that particular load.The total load you wish to run with the concerned cable.The actual voltage drop can vary depending on the condition of the wire, the conduit / raceway being used the temperature the connector the frequency etc.Īlternatively to compute the voltage drop and cable size, you require the following data. This calculator assumes that the circuit will operate in a normal condition room temperature with normal frequency. Step 3 – Check / Calculate Voltage Drop:Ĭheck for voltage drop with the cable size chosen.īelow is the formula to calculate the voltage drop of an electrical circuit based on the wire size and load current. For MCCB, this step is ignored.Ĭhoose the cable size whichever is greater in step 1 or step 2. For LT, if the circuit breaker used is ACB, then this step is done. K=90 (for Al cables), K=140 (for Cu cables) Where, K-constant depending on the conductor and insulation used. Formula used is,Ĭable size= (Fault current(in kA)*Fault clearing time)/K Next, find the cable size for the short circuit capacity of the system.
Get the cable size corresponding to this derated current from the catalog. Derating factors will be available in cable catalog. The current obtained has to derated since the cable is designed to operate at a defined temperature. You can also consider using an additional power supply to create a second, separate installation.Calculate the load current from the load data available. If voltage drop appears to be a concern, shorten your 12-volt power feed wires or switch to a heavier gauge wire (lower AWG number), or shorten the length of your LED tape lighting. As a practical approach, test your lighting prior to final installation. With longer lengths of LED tape lighting, voltage drop also occurs along the tape light. Voltage drop only becomes undesirable if you notice the brightness in one area of your lighting is objectionably different than in another area. It is a function of wire length, wire thickness and the energy or total watts used by the lighting. It is the gradual decrease in voltage that occurs along the length of the 12-volt power feed wires to the lighting, and varies depending on the type and size of the LED tape light installation. Voltage drop is a natural occurrence in low-voltage lighting systems. LED light color and brightness are best when 12-volt power feed wires from the power supply to the LED strip, or array of strips, is delivering as close to 12 volts as possible. The smaller the number, the thicker the wire. Wire Gauge (AWG) is the thickness of wire you are using, or want to use, in your LED tape lighting system. Wire Length is the length of your 12-volt power feed wire measured in feet from your power supply output to the front of the first LED strip in your lighting system. For optimum brightness, voltage should be at least 11.25 volts or better. This measurement will also tell you if you have too much voltage drop. Tip: Measure voltage at the power lead end of the LED strip or where the 12-volt power wire is connected to your LED tape lighting while the lighting is energized. Watts is calculated by multiplying volts by amps used in your LED system. To more accurately measure watts used by your 12-volt LED lighting system, use a multimeter.
VOLTAGE DROP CALCULATOR PRO
Please refer to the power requirement chart for your RibbonFlex Pro model to estimate the watts you are using. Total Watts Used is the total power consumed by your LED lighting system, not the watt rating of your power supply.
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