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.cDesigning a <strong>DALI</strong> applicationCalculating the voltage dropThe formula for calculating the voltage drop is as follows:U vVoltage drop in VI Current in A (0.25 A)S Cross section in mm 2lCable length in mγ Electrical conductivity in m / (Ω mm2),for copper cable: 56 m / (Ω mm2)I NOTICEThe maximum current of 250 mA must be used for calculating the voltage drop.Example: <strong>DALI</strong> circuit with a cable length of 300 m and a cable cross-section of 1.5 mm²Exact result:This example shows that:for a cable length of 300 m the voltage drop along the cable is 1.786 Va further voltage drop of 0.214 V is available for terminal points (contact resistance)Rule of thump:As it is somewhat tricky to calculate the cable length based on the voltage drop the rule of thumb is as follows:If a cross-section of 1.5 mm² is used, the maximum cable length is 300 m.If a smaller cross-section is used the possible cable length is reduced accordingly.I NOTICE<strong>Tridonic</strong> recommends always using a cable cross-section of 1,5 mm² for <strong>DALI</strong> control lines.<strong>DALI</strong> Manual | 08-2013 | en60 / 93
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