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Maintaining Ten Percent Voltage Drop


technical article from www.Marinco.com


TECHNICAL INFORMATION


Use 10% voltage drop for any "noncritical applications: windlass, cabin lights, etc....

ABYC Recommends... "Conductors used for panelboard or switchboard main feeders, bilge blowers, electronic equipment, navigation lights, and other circuits where voltage drop must be kept to a minimum, shall be sized for a voltage drop not to exceed three percent. Conductors used for lighting, other than navigation lights, and other circuits where voltage drop is not critical, shall be sized for a voltage drop not to exceed 10 percent." 11.16.1.2.7.



Table C: Conductors Sized (AWG) for 10% Voltage Drop

  Current (amps)   10% VOLTAGE DROP AT 12 VOLTS

Length

5 10

15

20

25

30

40

50

60

70

80

90

100

10'

18 18 18 16 16 14 14 12 12 10 10 10 10

15'

18 18 16 14 14 12 12 10 10 8 8 8 8

20'

18 16 14 14 12 12 10 10 8 8 8 6 6

25'

18 16 14 12 12 10 10 8 8 6 6 6 6

30'

18 14 12 12 10 10 8 8 6 6 6 6 4

40'

16 14 12 10 10 8 8 6 6 6 4 4 4

50'

16 12 10 10 8 8 6 6 4 4 4 2 2

60'

14 12 10 8 8 6 6 4 4 2 2 2 2

70'

14 10 8 8 6 6 6 4 2 2 2 2 1

80'

14 10 8 8 6 6 4 4 2 2 2 1 1

90'

12 10 8 6 6 6 4 2 2 2 1 1 0

100'

12 10 8 6 6 4 4 2 2 1 1 0 0

110'

12 8 8 6 6 4 2 2 2 1 0 0 0

120'

12 8 6 6 4 4 2 2 1 1 0 0 2/0

130'

12 8 6 6 4 4 2 2 1 0 0 2/0 2/0

140'

10 8 6 6 4 2 2 1 1 0 2/0 2/0 2/0

150'

10 8 6 4 4 2 2 1 0 0 2/0 2/0 3/0

160'

10 8 6 4 4 2 2 1 0 2/0 2/0 3/0 3/0

170'

10 6 6 4 2 2 2 1 0 2/0 2/0 3/0 3/0


  Current (amps)   10% VOLTAGE DROP AT 24 VOLTS

Length

5 10

15

20

25

30

40

50

60

70

80

90

100

10'

18 18 18 18 18 18 16 16 14 14 14 12 12

15'

18 18 18 18 16 16 14 14 12 12 12 10 10

20'

18 18 18 16 16 14 14 12 12 10 10 10 10

25'

18 18 16 16 14 14 12 12 10 10 10 8 8

30'

18 18 16 14 14 12 12 10 10 8 8 8 8

40'

18 16 14 14 12 12 10 10 8 8 8 6 6

50'

18 16 14 12 12 10 10 8 8 6 6 6 6

60'

18 14 12 12 10 10 8 8 6 6 6 6 4

70'

16 14 12 10 10 8 8 6 6 6 6 4 4

80'

16 14 12 10 10 8 8 6 6 6 4 4 4

90'

16 12 10 10 8 8 6 6 6 4 4 4 2

100'

16 12 10 10 8 8 6 6 4 4 4 2 2

110'

14 12 10 8 8 8 6 6 4 4 2 2 2

120'

14 12 10 8 8 6 6 4 4 2 2 2 2

130'

14 12 10 8 8 6 6 4 4 2 2 2 2

140'

14 10 8 8 6 6 6 4 2 2 2 2 1

150'

14 10 8 8 6 6 4 4 2 2 2 2 1

160'

14 10 8 8 6 6 4 4 2 2 2 1 1

170'

12 10 8 6 6 6 4 2 2 2 2 1 1


     Current (amps)   10% VOLTAGE DROP AT 32 VOLTS

Length

5

10

15

20

25

30

40

50

60

70

80

90

100

10'

18 18 18 18 18 18 18 16 16 14 14 14 14

15'

18 18 18 18 18 18 16 14 14 14 12 12 12

20'

18 18 18 18 16 16 14 14 12 12 12 10 10

25'

18 18 18 16 16 14 14 12 12 10 10 10 10

30'

18 18 18 16 14 14 12 14 10 10 10 10 8

40'

18 18 16 14 14 12 12 10 10 8 8 8 8

50'

18 16 14 14 12 12 10 10 8 8 8 6 6

60'

18 16 14 12 12 10 10 8 8 8 6 6 6

70'

18 14 14 12 10 10 8 8 8 6 6 6 6

80'

18 14 12 12 10 10 8 8 6 6 6 6 4

90'

18 14 12 10 10 10 8 6 6 6 6 4 4

100'

16 14 12 10 10 8 8 6 6 6 4 4 4

110'

16 14 12 10 10 8 8 6 6 6 4 4 4

120'

16 12 10 10 8 8 6 6 6 4 4 4 2

130'

16 12 10 10 8 8 6 6 6 4 4 2 2

140'

14 12 10 8 8 8 6 6 4 4 2 2 2

150'

14 12 10 8 8 6 6 6 4 4 2 2 2

160'

14 12 10 8 8 6 6 4 4 2 2 2 2

170'

14 12 10 8 8 6 6 4 4 2 2 2 2


Original article from Marinco website


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