Boat lift install..
#1
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Boat lift install..
So here is what I have. A 100 amp subpanel at the end of the pier fused at 50 amps from the house. I need to feed a boat lift that is 125' away at end of pier. The boat lift is rated for 120v @ 30 amps and 240 @ 20 amps. I was going to use it @ 120 v and ran a 10/3 down to it but forgot I need to de-rate the wire bc of the distance and should be 8/3. Now I'm ripping this wire out and going to run 240 instead . Now 8/3 would do the trick except I'm missing an insulated ground bc I'm running UF. My question is do they make 8/4 UF or what would be my best option as far as what wire to use. Trying to get away from running PVC. Also what can I use for disconnecting means at the motor? It has a cord now but when I switch to 240 I will wire from disconnect or whatever into it. What would you guys do?
#2
You only need #12 for a 20 amp 240 volt feed. Is 20 amps the full load of the lift or the manufacturer's recommended circuit size? 125 feet may be border line at 125 feet but that depends on the lifts full load amps.
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I'll presume what you are connecting is essentialy a "motor-type" Branch Circuit , a type of Branch-Circuit that does not require an insulated Equiptment Grounding Conductor.
The design of such a circuit is based on the motor circuit ratings as indicated on the name-plate . Essentialy , this is the horsepower and full-load current ratings which determine the ampacity of the conductors, the rating of the circuit-breaker , and the motor dis-connecting means..
The design of such a circuit is based on the motor circuit ratings as indicated on the name-plate . Essentialy , this is the horsepower and full-load current ratings which determine the ampacity of the conductors, the rating of the circuit-breaker , and the motor dis-connecting means..
#4
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20 amp for 240, 30 amp for 120v is the recommended breaker sizes. And in MD everything on pier has to have insulated ground. That's why I have to tape up the red leaving me without a neutral. And after 120' don't you have to de-rate the wire making this a #8 feed?
#5
And after 120' don't you have to de-rate the wire making this a #8 feed?
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So I'm going to run 4 # 10's THhn through 3/4 inch pipe. Once I get to boat lift what type of disconect should I use? The sub panel is 125' away so I'm sure u need one.
#8
So I'm going to run 4 # 10's THhn through 3/4 inch pipe.
what type of disconect should I use?
It has a cord now but when I switch to 240 I will wire from disconnect or whatever into it.
#9
So I'm going to run 4 # 10's THhn through 3/4 inch pipe.
Once I get to boat lift what type of disconect should I use?