Full Line Product Catalog Full Line P rod uct C atalog - Marine Office

Technical DATATable B: ConductorsSized (AWG) for 3%Voltage DropUse 3% voltage drop for any “criticalapplication” affecting the safety ofthe vessel or its passengers: bilgepumps, navigation lights, electronics,etc....IMPORTANT!Length (feet): Determined bymeasuring the length of theconductor from the positive (+) powersource connection to the electricaldevice and back to the negative (-)power source connection. Note thatthe power source connection maybe either the battery, panelboard orswitchboard.Current (amps): Determined byadding the total amps on a circuit.Conductor sizes not covered in TableB or Table C may be calculated byusing the following formula:CM = K x I x LEAfter calculating the Circular Mil Area(CM), use Table E to determine theproper conductor size (National FireProtection Agency and Coast Guardrequire that the next larger conductorbe used when the calculated CMarea falls between the two conductorsizes).CM = Circular Mil Area of ConductorsK = 10.75 (Constant representing themil-foot resistance of copper)I = Current - amps / L = Length - feetE = Voltage drop at load (in voltagedrop in a decimal expression)3% Voltage DROP AT 12 VOLTSCurrent (amps)Length 5 10 15 20 25 30 40 50 60 70 80 90 10010' 18 14 12 10 10 8 6 6 6 6 6 4 415' 16 12 10 10 8 8 6 6 4 4 4 2 220' 14 10 10 8 6 6 6 4 4 2 2 2 225' 12 10 8 6 4 4 4 2 2 2 2 1 130' 12 10 8 6 6 6 4 4 2 2 2 1 140' 10 8 6 6 4 4 2 2 1 1/0 1/0 2/0 2/050' 10 6 6 4 4 2 2 1 1/0 2/0 3/0 4/0 4/060' 10 6 6 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/070' 8 6 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/080' 8 6 4 2 2 1 1/0 2/0 3/0 4/0 4/090' 8 4 2 2 1 1/0 2/0 3/0 4/0 4/0100' 6 4 2 2 1 1/0 2/0 3/0 4/0110' 6 4 2 2 1 1/0 2/0 3/0 4/0120' 6 4 2 1 1/0 2/0 3/0 4/0130' 6 2 2 1 1/0 2/0 3/0 4/0140' 6 2 2 1/0 2/0 3/0 4/0150' 6 2 1 1/0 2/0 3/0 4/0160' 6 2 1 1/0 2/0 3/0 4/0170' 6 2 1 2/0 3/0 3/0 4/03% Voltage DROP AT 24 VOLTSCurrent (amps)Length 5 10 15 20 25 30 40 50 60 70 80 90 10010' 18 18 16 14 12 12 10 10 10 8 8 8 615' 18 16 14 12 12 10 10 8 8 6 6 6 620' 18 14 12 10 10 10 8 6 6 6 6 4 425' 16 12 12 10 10 8 6 6 6 4 4 4 430' 16 12 10 10 8 8 6 6 4 4 4 2 240' 14 10 10 8 6 6 6 4 4 2 2 2 250' 12 10 8 6 6 6 4 4 2 2 2 1 160' 12 10 8 6 6 4 4 2 2 1 1 1/0 1/070' 12 8 6 6 4 4 2 2 1 1 1/0 1/0 2/080' 10 8 6 6 4 4 2 2 1 1/0 1/0 2/0 2/090' 10 8 6 4 4 2 2 1 1/0 1/0 2/0 2/0 3/0100' 10 6 6 4 4 2 2 1 1/0 2/0 2/0 3/0 3/0110' 10 6 6 4 2 2 1 1/0 1/0 2/0 3/0 3/0 4/0120' 10 6 4 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/0130' 8 6 4 2 2 2 1 1/0 2/0 3/0 3/0 4/0 4/0140' 8 6 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/0150' 8 6 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/0160' 8 6 4 2 2 1 1/0 2/0 3/0 4/0 4/0 4/0170' 8 6 2 2 1 1 2/0 3/0 3/0 4/0 4/0WIRE & WIRE MANAGEMENTFor Example...Q: A bilge pump draws 10 amps.The positive run is 11 feet fromthe power panel, including the floatswitch. The negative run is only 10feet. What size is the wire?A: Use the formula to reach thecorrect answer:Table D shows that 12 AWG wirehas a CM area of 6,500 and is thecorrect choice. However, SAE wirehas a CM area of only 5,833. UnderNFPA and USCG regulations, 10 SAEwire must be used.3% Voltage DROP AT 32 VOLTSCurrent (amps)Length 5 10 15 20 25 30 40 50 60 70 80 90 10010' 18 18 16 16 14 14 12 12 10 10 10 8 815' 18 16 14 14 12 12 10 10 8 8 8 6 620' 18 16 12 12 12 10 10 8 8 6 6 6 625' 18 14 12 12 10 10 8 8 6 6 6 6 430' 16 14 10 10 10 8 8 6 6 6 4 4 440' 16 12 10 10 8 8 6 6 4 4 4 2 250' 14 12 8 8 8 6 6 4 4 2 2 2 260' 14 10 8 8 6 6 4 4 2 2 2 2 170' 12 10 6 6 6 6 4 2 2 2 1 1 080' 12 10 6 6 6 4 4 2 2 1 1 0 090' 12 8 6 6 6 4 2 2 2 1 1/0 1/0 2/0100' 12 8 6 6 4 4 2 2 1 1/0 1/0 2/0 2/0110' 10 8 6 6 4 4 2 2 1 1/0 1/0 2/0 2/0120' 10 8 6 4 4 2 2 1 1/0 1/0 2/0 2/0 3/0130' 10 8 6 4 4 2 2 1 1/0 2/0 2/0 3/0 3/0140' 10 6 6 4 2 2 1 1/0 1/0 2/0 3/0 3/0 3/0150' 10 6 6 4 2 1 1 1/0 2/0 2/0 3/0 3/0 4/0160' 10 6 4 4 2 1 1 1/0 2/0 3/0 3/0 4/0 4/0170' 8 6 4 2 2 1 1 1/0 2/0 3/0 3/0 4/0 4/0MARINCO | marinco.com | 31