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Old 08-24-2019, 01:57 PM   #1
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Default Table D3 having issues witht his table

Can some please go through this question with me.
Which size of copper conductor is required to limit voltage drop to 2% where potential is 120V, current is 10A and the one way distance from the distribution point is 25m ?
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Old 08-24-2019, 02:17 PM   #2
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Please fill out your profile or some will think you are a DIYer. Tnx
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Old 08-24-2019, 02:25 PM   #3
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Can only figure out how to change my profile picture and birthday?
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Old 08-24-2019, 02:36 PM   #4
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Turn your phone sideways & choose desktop view.
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Old 08-24-2019, 04:20 PM   #5
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Quote:
Originally Posted by Grinding View Post
Can some please go through this question with me.
Which size of copper conductor is required to limit voltage drop to 2% where potential is 120V, current is 10A and the one way distance from the distribution point is 25m ?
You were given the answer to your last D3 question in this thread ... https://www.electriciantalk.com/f129...d3-cec-274624/

We're not here to do your homework, but many will help you understand how to use the table and formula.
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Old 08-24-2019, 05:03 PM   #6
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Follow the example given in note 9. Here is the example.

6.1m x 3(%) x 1.04 x 240/120 = 38m

There are four things you need using table D3 and this formula to find the max distance allowed with voltage drop.

1-6.1m is the value found in table D3 using the amperage and wire size

2-3(%) is the amount of voltage drop your looking for. Table D3 is only for 1% so you need to multiply by the amount of drop your looking for. Just use the number, do not use percentage. So if your looking for 5% drop, you would use the number 5 in the equation.

3-1.04 is from the table in note 3 of table D3. Basically what percentage of the full ampacity of the wire are you using? So if you had a 12 awg wire and were using 10 amps, you would be using 40% of that wires capacity (10/25=40%) You then choose the number in that table for 40% and, in most cases, 75 degree wire.

4-240/120 is the voltage your using. Table D3 is only for 120 volts so if your using 120 volts, you just multiply by 1 in the formula. If your using any other voltage, you devide that voltage by 120 and use that number in the equation.


Multiply those 4 things and you will get the maximum distance allowed for that run including voltage drop
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Old 09-01-2019, 01:35 PM   #7
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if you don't like to do calculations using table D3 there are several voltage drop calculators online/apps. I like south wire's
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