Sorry E, but the wire he has is just fine for the load he's putting on it. I agree that 12 AWG would be a wiser choice...but if he's got the 14 AWG, it'll do.
The voltage drop for a 1 amp load is only 2.54% or so, and below the ABYC 3% drop suggested for nav lights. I'd recommend using the voltage drop calculator over at genuinedealz.com, since you can enter your own numbers in...
Originally Posted by eherlihy
ABYC publishes a table of wire gauge based on length and load with 3% Voltage Drop, and 10% voltage drop. Here is a link to the tables in PDF
For example, given a 5A load (the lowest rated load in the table) and AWG 14 wire (what the OP has) the longest allowable run with a 10% voltage drop is 80'. If you want to tighten the spec to 3%, which as fairbank56 pointed out is required for navigation lights, the longest run for AWG 14 is 20'.
If the OP hasn't already purchased the wire, I suggest he consider going down an AWG size.
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