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post #1 of 12 Old 02-11-2013 Thread Starter
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Re-wiring mast...What size wire?

The mast is off. I'm replacing lights and wiring. The boat is 12 gauge wire throughout. I am adding an LED anchor light at the top. Do I need to run #12 wire for this light or can I go with something smaller?
This is the light.
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post #2 of 12 Old 02-11-2013
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Re: Re-wiring mast...What size wire?

That is a 0.12 Amp load. AWG #12 should be fine (overkill).

Because this is a Nav. light, the maximum allowed voltage drop is 3%.


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Re: Re-wiring mast...What size wire?

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That is a 0.12 Amp load. AWG #12 should be fine (overkill).

Because this is a Nav. light, the maximum allowed voltage drop is 3%.
Oh Yeah.... way overkill. May be to consider redo the VHF cable, overkill is better in this case.


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post #4 of 12 Old 02-11-2013
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Re: Re-wiring mast...What size wire?

If I was wiring my own mast, I'd run an NMEA 2000 cable up there - in case you ever want to put a new wind instrument in.

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Re: Re-wiring mast...What size wire?

to calculate the wire size you need wire length. my Led anchor light has 110 feet of #18 gauge. 100 feet of #18 is good for 1.5 amps. remember you have wire going up and back so the length of the mast times 2

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Re: Re-wiring mast...What size wire?

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Originally Posted by eherlihy View Post
That is a 0.12 Amp load. AWG #12 should be fine (overkill).

Because this is a Nav. light, the maximum allowed voltage drop is 3%.
I was curious about how much amp draw the light would create. Where did you see the 0.12 amp load number?
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Re: Re-wiring mast...What size wire?

the ad says it draws 1 watt so at 12 volts it would be P=IE or .083 amps

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Re: Re-wiring mast...What size wire?

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Originally Posted by overbored View Post
to calculate the wire size you need wire length. my Led anchor light has 110 feet of #18 gauge. 100 feet of #18 is good for 1.5 amps. remember you have wire going up and back so the length of the mast times 2
Keep in mind that the minimum wire size under ABYC standards for an application such as nav lights is 16GA regardless of the voltage drop.
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Re: Re-wiring mast...What size wire?

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Originally Posted by Maine Sail View Post
Keep in mind that the minimum wire size under ABYC standards for an application such as nav lights is 16GA regardless of the voltage drop.
So then jerk some 14 gauge up there and in 20 years with ABYC changes it's standards you are still good

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Re: Re-wiring mast...What size wire?



I used a piece of 16/5 round in a conduit and i made a hole at the steaming/deck-light exit 1/2 way up

The 16/5 and the coax cable was a tight fit in 3/4 pvc BUT never any noise

Then opened up a bit of the jacket so i could pull 3 wires out at the steaming/deck-light exit and ran the other two up top to the anchor light

The round seals much better with a cable clam and all the connections are below deck in a terminal box

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