Cooling & Heating - Andrews Sykes

Electrical data2520Volts1.5 sq.mm3 PHASE2.5 sq.mm4 sq.mmVolts76Per 100 met. cable151056 sq.mm10 sq.mm16 sq.mm5432Per 100 feet cable10408 12 16 20 24 28 AmpsVolt dropPer 100 met. cableSINGLE PHASEVoltsVolts257The amount of voltage lost when using long cable lengths, causes cable to get hot and206become unsafe. The motor will also draw excessive current causing overloads to trip and151051.5 sq.mm2.5 sq.mmmotor to overheat the maximum permissible voltage drop over a length of cable is 2.5%.4 sq.mmTo calculate volt drop use table on page 79 or use the following calculation, based on4copper cable.6 sq.mmVoltage drop = Length of cable (m) x 0.018 (resist) x Amps x 1.732Cross sectional area of cable (mm 2 )10 sq.mm531Per 100 feet cableThe above will give the voltage lost in cable length (v) divide by the supply 0 voltage will048 12 16 20 Ampsgive the % drop which must not exceed 2.5%Note: Max voltage drop allowed must not exceed 2.5% of the normal voltageExample16 Amp 3 phase 415 volt pump using 60 metres of 2.5mm cable60 X 0.018 x 16 x 1.73 = 11.962.5mm 211.96 volt / 415 volt = 2.8% Therefore a larger cable is required as the volt dropexceeds 2.5%or Call Us Free 0800 211 611165