ROGUE MPT-3024, Installation Manual And Owner'S Manual, Page: 10 / 52

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NEC 310-15 restricts the minimum wire size for a 30-amp circuit to 10-gauge.
12-gauge may be used for installations of 20 amps or less, provided that the
length of the wire does not cause a significant voltage drop. Ideally the voltage
drop in any of your wiring runs should be 2% or less of the system voltage: for
example, this would be approximately 0.24 volts for a 12-volt system, or 0.48
volts for a 24-volt system. Refer to Tables 4.2.1 and 4.2.2 for help in
determining the proper gauge of wire when factoring in voltage drop and
distance.
#12 #10 #8 #6 #4 #2
5A 30 47 75 119 190 302
10A 15 24 37 60 95 151
15A 10 16 25 40 63 101
20A 7 12 19 30 47 75
25A — 9 15 24 38 60
30A — 8 12 20 32 50
Table 4.2.1. Maximum distance (in feet) for wire at a specific gauge and cur-
rent, which will result in no more than a 0.24v (2%) voltage drop when used
with a 12-VOLT nominal system. Divide these distances in half for a round-trip
(both positive and negative) wire run.
#12 #10 #8 #6 #4 #2
5A 59 94 150 238 379 604
10A 30 47 75 119 190 302
15A 20 31 50 79 126 201
20A 15 24 37 60 95 151
25A — 19 30 48 76 121
30A — 16 25 40 63 101
Table 4.2.2. Maximum distance (in feet) for wire at a specific gauge and cur-
rent, which will result in no more than a 0.48v (2%) voltage drop when used
with a 24-VOLT nominal system. Divide these distances in half for a round-trip
(both positive and negative) wire run.