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Can I use #10 wire for a 30A, 240V pump circuit?
Wire Gauge/Type for 100amp detached Shop?Which cable/conduit should I use to run a new 240 volt line for an oven?Electrical circuit dead, wire seems brokenHow should I wire a subpanel for a tiny house?Can I run THHN for separate washer and dryer circuits through the same conduit?open multi wire electrical branch circuitsElectrician connected new water well to house panel, but confused about wire size in generator transfer switch?How to add tiny 0.5A 120V load to very remote split phase 240v 3 wire well houseRunning 240v power to detached garage for electric vehicleWiring Pool Subpanel for Pump and Receptacles
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I have 2 30amp breakers connected together. I believe this gives me 220v. I plan to connect this circuit to a 220v irrigation pump. It looks like the original wire from the main circuit is 12 gauge. The pump will be around 160' from the breaker. can I use 10 gauge wire from the back of the house to the pump or must I use 12 gauge? The distance from the back of the house to the pump is around 100' I would like to mention that the wire will go from the house to a relay box then to the pump. The relay is going to be connected to the irrigation timer and the water pump. We live in Melbourne, FL.
wiring
edited 8 hours ago
isherwood
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Roger OdiorneRoger Odiorne
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I have 2 30amp breakers connected together. I believe this gives me 220v. I plan to connect this circuit to a 220v irrigation pump. It looks like the original wire from the main circuit is 12 gauge. The pump will be around 160' from the breaker. can I use 10 gauge wire from the back of the house to the pump or must I use 12 gauge? The distance from the back of the house to the pump is around 100' I would like to mention that the wire will go from the house to a relay box then to the pump. The relay is going to be connected to the irrigation timer and the water pump. We live in Melbourne, FL.
wiring
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago
add a comment |
I have 2 30amp breakers connected together. I believe this gives me 220v. I plan to connect this circuit to a 220v irrigation pump. It looks like the original wire from the main circuit is 12 gauge. The pump will be around 160' from the breaker. can I use 10 gauge wire from the back of the house to the pump or must I use 12 gauge? The distance from the back of the house to the pump is around 100' I would like to mention that the wire will go from the house to a relay box then to the pump. The relay is going to be connected to the irrigation timer and the water pump. We live in Melbourne, FL.
wiring
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have 2 30amp breakers connected together. I believe this gives me 220v. I plan to connect this circuit to a 220v irrigation pump. It looks like the original wire from the main circuit is 12 gauge. The pump will be around 160' from the breaker. can I use 10 gauge wire from the back of the house to the pump or must I use 12 gauge? The distance from the back of the house to the pump is around 100' I would like to mention that the wire will go from the house to a relay box then to the pump. The relay is going to be connected to the irrigation timer and the water pump. We live in Melbourne, FL.
wiring
wiring
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
edited 8 hours ago
isherwood
54.9k5 gold badges65 silver badges143 bronze badges
54.9k5 gold badges65 silver badges143 bronze badges
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
asked 8 hours ago
Roger OdiorneRoger Odiorne
61 bronze badge
61 bronze badge
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Roger Odiorne is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago
add a comment |
Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago
Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago
add a comment |
2 Answers
2
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As the gauge number goes up, the size goes DOWN. You cannot use 12ga wire on a 30A breaker, 10ga is the minimum size. Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. How you combat voltage drop is to increase the wire size relative to the load. Since you did not post any information on the irrigation pump, we cannot help you further.
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
add a comment |
10 gauge is larger than 12 gauge. If you meant "can I use the smaller one coz it's cheaper", the answer to that is pretty universally no, but you don't need us to tell you that.
The distance might be a factor that might call for going with a larger wire (that would be #8 or #6). But if your pump is recommending the 30A breaker, its draw is certainly somewhat less due to the 125% derating requirement -- its draw is probably 19-23A. (still, too much for #12 wire). You don't need to care about voltage drop at the 30A breaker trip. You need to worry about it for actual working current of worst-case 23A. At that particular distance and #10 wire, your voltage drop will certainly be around 3%, which will even make the wire salesman happy.
Wire salesmen want you to be around 3% voltage drop on any wiring run. But Code doesn't require anything like that, so they're just saying it to push wire. Code gets concerned when drop gets around 8%. I bet this is a homerun, so all the voltage drop will be in this cable. This drop may be something like 3.17%, and voltage drop calculators online will say "that is over 3% therefore unacceptable" but that's silly.
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
add a comment |
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2 Answers
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2 Answers
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As the gauge number goes up, the size goes DOWN. You cannot use 12ga wire on a 30A breaker, 10ga is the minimum size. Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. How you combat voltage drop is to increase the wire size relative to the load. Since you did not post any information on the irrigation pump, we cannot help you further.
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
add a comment |
As the gauge number goes up, the size goes DOWN. You cannot use 12ga wire on a 30A breaker, 10ga is the minimum size. Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. How you combat voltage drop is to increase the wire size relative to the load. Since you did not post any information on the irrigation pump, we cannot help you further.
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
add a comment |
As the gauge number goes up, the size goes DOWN. You cannot use 12ga wire on a 30A breaker, 10ga is the minimum size. Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. How you combat voltage drop is to increase the wire size relative to the load. Since you did not post any information on the irrigation pump, we cannot help you further.
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
As the gauge number goes up, the size goes DOWN. You cannot use 12ga wire on a 30A breaker, 10ga is the minimum size. Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. How you combat voltage drop is to increase the wire size relative to the load. Since you did not post any information on the irrigation pump, we cannot help you further.
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
answered 8 hours ago
J. RaefieldJ. Raefield
6,3942 silver badges18 bronze badges
6,3942 silver badges18 bronze badges
add a comment |
add a comment |
10 gauge is larger than 12 gauge. If you meant "can I use the smaller one coz it's cheaper", the answer to that is pretty universally no, but you don't need us to tell you that.
The distance might be a factor that might call for going with a larger wire (that would be #8 or #6). But if your pump is recommending the 30A breaker, its draw is certainly somewhat less due to the 125% derating requirement -- its draw is probably 19-23A. (still, too much for #12 wire). You don't need to care about voltage drop at the 30A breaker trip. You need to worry about it for actual working current of worst-case 23A. At that particular distance and #10 wire, your voltage drop will certainly be around 3%, which will even make the wire salesman happy.
Wire salesmen want you to be around 3% voltage drop on any wiring run. But Code doesn't require anything like that, so they're just saying it to push wire. Code gets concerned when drop gets around 8%. I bet this is a homerun, so all the voltage drop will be in this cable. This drop may be something like 3.17%, and voltage drop calculators online will say "that is over 3% therefore unacceptable" but that's silly.
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
add a comment |
10 gauge is larger than 12 gauge. If you meant "can I use the smaller one coz it's cheaper", the answer to that is pretty universally no, but you don't need us to tell you that.
The distance might be a factor that might call for going with a larger wire (that would be #8 or #6). But if your pump is recommending the 30A breaker, its draw is certainly somewhat less due to the 125% derating requirement -- its draw is probably 19-23A. (still, too much for #12 wire). You don't need to care about voltage drop at the 30A breaker trip. You need to worry about it for actual working current of worst-case 23A. At that particular distance and #10 wire, your voltage drop will certainly be around 3%, which will even make the wire salesman happy.
Wire salesmen want you to be around 3% voltage drop on any wiring run. But Code doesn't require anything like that, so they're just saying it to push wire. Code gets concerned when drop gets around 8%. I bet this is a homerun, so all the voltage drop will be in this cable. This drop may be something like 3.17%, and voltage drop calculators online will say "that is over 3% therefore unacceptable" but that's silly.
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
add a comment |
10 gauge is larger than 12 gauge. If you meant "can I use the smaller one coz it's cheaper", the answer to that is pretty universally no, but you don't need us to tell you that.
The distance might be a factor that might call for going with a larger wire (that would be #8 or #6). But if your pump is recommending the 30A breaker, its draw is certainly somewhat less due to the 125% derating requirement -- its draw is probably 19-23A. (still, too much for #12 wire). You don't need to care about voltage drop at the 30A breaker trip. You need to worry about it for actual working current of worst-case 23A. At that particular distance and #10 wire, your voltage drop will certainly be around 3%, which will even make the wire salesman happy.
Wire salesmen want you to be around 3% voltage drop on any wiring run. But Code doesn't require anything like that, so they're just saying it to push wire. Code gets concerned when drop gets around 8%. I bet this is a homerun, so all the voltage drop will be in this cable. This drop may be something like 3.17%, and voltage drop calculators online will say "that is over 3% therefore unacceptable" but that's silly.
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
10 gauge is larger than 12 gauge. If you meant "can I use the smaller one coz it's cheaper", the answer to that is pretty universally no, but you don't need us to tell you that.
The distance might be a factor that might call for going with a larger wire (that would be #8 or #6). But if your pump is recommending the 30A breaker, its draw is certainly somewhat less due to the 125% derating requirement -- its draw is probably 19-23A. (still, too much for #12 wire). You don't need to care about voltage drop at the 30A breaker trip. You need to worry about it for actual working current of worst-case 23A. At that particular distance and #10 wire, your voltage drop will certainly be around 3%, which will even make the wire salesman happy.
Wire salesmen want you to be around 3% voltage drop on any wiring run. But Code doesn't require anything like that, so they're just saying it to push wire. Code gets concerned when drop gets around 8%. I bet this is a homerun, so all the voltage drop will be in this cable. This drop may be something like 3.17%, and voltage drop calculators online will say "that is over 3% therefore unacceptable" but that's silly.
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
edited 6 hours ago
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
answered 7 hours ago
HarperHarper
87.9k5 gold badges64 silver badges179 bronze badges
87.9k5 gold badges64 silver badges179 bronze badges
add a comment |
add a comment |
Roger Odiorne is a new contributor. Be nice, and check out our Code of Conduct.
Roger Odiorne is a new contributor. Be nice, and check out our Code of Conduct.
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Welcome to DIYSE. FYI, it's 120v and 240v. 220 is an obsolete half-century-old spec that no longer applies. Not entirely relevant, but it cleared up some confusion for me when I learned.
– isherwood
8 hours ago
It was 110/220 when mains electric power was first sold to the masses in the 1910s.
– Harper
7 hours ago