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If you are referring to residential wiring, then refer to the appropriate tables in BS 7671:2008 Requirements for Electrical Installations (the IEE Wiring Regulations). It's too complicated to be answered in this forum and requires prerequesite knowledge you may not have.

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Q: How do you compute voltage drop and cable size over distance in the UK?
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Related questions

Will voltage drop over cable distance?

If the voltage is supplying any current through the cable, i.e. if there is any 'load' at the end, then the voltage will drop through the cable.


What effect does it have on the voltage drop in an electrical cable if the resistance of the cable is decreased?

It will decrease the voltage drop.


Why drop voltage in xlpe cable is more than PVC cable?

The voltage drop in a wire has nothing to do with the insulation. Voltage drop has to do with the cross sectional area of the wire.


How do you find cross sectional area of cable when you have the lent current and the voltage drop?

cross sectional area of cable * voltage drop


Is there a rule to distance of cable from a power source to low voltage lighting without voltage drop and do you have to put transformers or outlets in the yard?

Voltage drop depends on the size & length of the wire and the wattage of the bulbs. If they make an LED replacement bulb , you would hardly notice the voltage drop.


What is voltage drop when utilized with cable runs?

A: ANY CABLE will have a definite impedance and if current flow there is going to be a definite voltage drop because of it


What is the voltage drop for 16 mm Cable over 100 meters?

The voltage drop depends on the current through the cable.For DC current in cable of 16 mm diameter, at 68° F, the voltage drop is(0.00857) x (current, Amperes) volts.


How do you calculate voltage drop in a parallel circuit?

The formula for a simple DC voltage drop across a cable is:VDrop = Vmeasured at the input of cable - Vmeasured at the output of cableThis formula may seem simplistic however keep in mind that the sensitivity, accuracy and resolution of measuring instrument instrument is what is really important.If you know the DC current flowing through the cable and the impedance of the cable then you can use Ohm's law. Vdrop = I R where Vdrop is the voltage drop across the cable in volts I is the current flowing through the cable in amperes R is the resistance of the cable in ohms.ADDITIONALCalculation of the voltage drop is given by the formula belowVoltage Drop (Volt) = [(mV/Am)/1000] * I * lWhere mV/Am = millivolt drop per meter per ampere of the cable(this information is given in the table based on IEE Wiring Regulation)I = Current in the cable (in Ampere)l = Distance of cable (in Metre)See related links below


Is it okay to use thicker cable to avoid voltage drop?

It is mandatory to use a larger wire size to overcome voltage drop at the load.


How do you calculate the cable size for a run of 30 meters?

to calculate the cable size of a run of 30 meters long you first will have to know the current of the appliance use the voltage drop formula V d = (mVxIxL)/1000 once the voltage drop is less than 2.5% of the nominal voltage, the cable should be upsize.


How do you compute voltage drop?

The answer will depend on many factors such as:distance between the two points for which a voltage drop is to be calculated i.e the length of the cable runwire size and material (copper, aluminum...)type of insulation used in the cabletype of cable fixing (in the open air, along a wall, in a duct, underground, etc.)expected ambient temperature at full loadFor more information please see the Related Link and the answers to the Related Questions shown below.


What will the voltage drop on a 1.5 mm cable run 1.5 kilometres be?

This is a voltage drop question. The amperage of the circuit must be given. Without the load amperage this question can not be answered.