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Old 12-14-2008, 12:40 PM   #31
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Lights dim


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Originally Posted by TazinCR View Post
If the neutral goes out doesn't he end up with nothing except 220 outlets with no neutral and no power on the 110v outlets. Where would the 220 to the outlets come from if the neutral breaks?

Use a pencil/paper and draw the circuit including a load and you will see.

If there is no 120 loads, there is no 240 path.



Last edited by 220/221; 12-14-2008 at 12:50 PM.
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Old 12-14-2008, 01:39 PM   #32
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Lights dim


I can't post spreadsheets but here is one that is self explanatory that analyzes a resi. circuit.

Ia, Ib are the currents circulated due to V1, V2, respectively
They both go through Rn, the current through Rn being Ia - Ib.

120.0 ent V1, volts
120.0 ent V2, volts
0.1 ent Rn, ohms
40.0 ent R1, ohms
20.0 ent R2, ohms

20.1 calc'd A= Rn+R2=
40.1 calc'd B=R1+Rn=
4,824.0 calc'd Num1= V1*Rn+B*V2
806.0 calc'd Denom1= (A*B)-(Rn^2)
6.0 calc'd Ib= Num1/Denom1, amps
120.6 calc'd Num2= C*Rn + V1
40.1 calc'd Denom2= B
3.0 calc'd Ia= Num2/Denom2, amps


1,079.1 calc'd total power in, (V1*Ia) + (V2*Ib), watts
0.9 calc'd power dissipated in Rn, [(Ia-Ib)^2]*Rn, watts
361.8 calc'd power dissipated in R1, [Ia^2]*R1, watts
716.4 calc'd power dissipated in R2, [Ib^2]*R2, watts
1,079.1 calc'd total power dissipated, watts


0.3 calc'd voltage across Rn, volts
120.3 calc'd voltage across R1, volts
119.7 calc'd voltage across R2, volts

0.6 calc'd voltage difference, R1-R2, volts

Last edited by Yoyizit; 12-14-2008 at 02:07 PM.
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Old 12-14-2008, 03:49 PM   #33
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Lights dim


Thanks 220 got it. I was not thinking about a load just the outlet.
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Old 12-14-2008, 04:53 PM   #34
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Lights dim


Quote:
Originally Posted by Yoyizit View Post
I can't post spreadsheets but here is one that is self explanatory that analyzes a resi. circuit.

Ia, Ib are the currents circulated due to V1, V2, respectively
They both go through Rn, the current through Rn being Ia - Ib.

120.0 ent V1, volts
120.0 ent V2, volts
0.1 ent Rn, ohms
40.0 ent R1, ohms
20.0 ent R2, ohms

20.1 calc'd A= Rn+R2=
40.1 calc'd B=R1+Rn=
4,824.0 calc'd Num1= V1*Rn+B*V2
806.0 calc'd Denom1= (A*B)-(Rn^2)
6.0 calc'd Ib= Num1/Denom1, amps
120.6 calc'd Num2= C*Rn + V1
40.1 calc'd Denom2= B
3.0 calc'd Ia= Num2/Denom2, amps


1,079.1 calc'd total power in, (V1*Ia) + (V2*Ib), watts
0.9 calc'd power dissipated in Rn, [(Ia-Ib)^2]*Rn, watts
361.8 calc'd power dissipated in R1, [Ia^2]*R1, watts
716.4 calc'd power dissipated in R2, [Ib^2]*R2, watts
1,079.1 calc'd total power dissipated, watts


0.3 calc'd voltage across Rn, volts
120.3 calc'd voltage across R1, volts
119.7 calc'd voltage across R2, volts

0.6 calc'd voltage difference, R1-R2, volts
And I thought I was bored today
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Old 12-14-2008, 04:58 PM   #35
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Lights dim


Quote:
Originally Posted by Silk View Post
And I thought I was bored today
Is God perfect?
Therefore, does He (or She) speak a perfect language?
Is mathematics a perfect language?
'Nuff said. . .

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