60 amp panel upgrade

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highendtron

highendtron

Senior Member
Man, I love this forum!!!!( except fpr the dog song which would have been ok if one would have just been able to watch her walk her dog...but we had to listen to her miss all the high notes, oh well). After all the talk on mwbc I rechecked the 12/3 runs and the ungrounded conductors were on different phases so I will put them back like I found them. I agree with Dennis that because of the dangers with losing a nuetral in single phase services, I would be reluctant to run mwbc with one nuetral. Thanks, learning is a constant for those humble enough to ask and listen!
 
frizbeedog

frizbeedog

Senior Member
Location
Oregon
highendtron said:
Man, I love this forum!!!!( except fpr the dog song which would have been ok if one would have just been able to watch her walk her dog...but we had to listen to her miss all the high notes, oh well).
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This missed notes were an artistic choice.....I think.

Like whether or not one installs MWBC's.....or an EGC in a EMT conduit run. :wink:

She can miss all the notes she wants if she'll walk my dog. :grin:

Woof.
 
LarryFine

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
What was confusing to some was saying that only a properly-connected MWBC is a MWBC. That's technically correct, of course, but it's easy to misunderstand that whether a given home run is a MWBC or not can depend on how you feed it, and with no other changes.

Not only has MWBC wiring been common for decades, I use them whenever possible, especially including when extending existing circuits. I'll combine 2-wire circuits and use 3-conductor cable as much as possible, even if it means one 15a and one 20a circuit.

In other words, if there's an even number of 15a circuits, I run half that many 14-3's, and the same with the 20a circuits. If there's an odd number of one of them, I'll run one 2-conductor cable. If there's an odd number of both, I'll use a 12-3 and one will be a 15a circuit.
 
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frizbeedog

frizbeedog

Senior Member
Location
Oregon
LarryFine said:
What was confusing to some was saying that only a properly-connected MWBC is a MWBC. That's echnically correct, of course, but it's easy to misunderstand that whether a given home run is a MWBC or not can depend on how you feed it, and with no other changes.

Not only has MWBC wiring been common for decades, I use them whenever possible, especially including when extending existing circuits. I'll combine 2-wire circuits and use 3-conductor cable as much as possible, even if it means one 15a and one 20a circuit.

In other words, if there's an even number of 15a circuits, I run half that many 14-3's, and the same with the 20a circuits. If there's an odd number of one of them, I'll run one 2-conductor cable. If there's an odd number of both, I'll use a 12-3 and one will be a 15a circuit.
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echnically?

Sorry, you still have time. :grin:
 
peter d

peter d

Senior Member
Location
New England
LarryFine said:
If there's an odd number of one of them, I'll run one 2-conductor cable. If there's an odd number of both, I'll use a 12-3 and one will be a 15a circuit.
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How dare you! What is the homeowner decides to change the breaker after you leave? :roll:

:D
 
LarryFine

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
peter d said:
How dare you! What is the homeowner decides to change the breaker after you leave? :roll:

:D
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I'll send in the breaker police.



If you want a serious answer, splice a piece of #14 onto the #12 close to where it enters the box.
 
peter d

peter d

Senior Member
Location
New England
LarryFine said:
If you want a serious answer, splice a piece of #14 onto the #12 close to where it enters the box.
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I would rig up one of those gag gifts where a snake pops out of a can if they take the panel cover off.
 
2

220/221

Senior Member
Location
AZ
I agree with Dennis that because of the dangers with losing a nuetral in single phase services, I would be reluctant to run mwbc with one nuetral
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It's hard not to when they are basically going to the same place or even to the same BOX (Dw/disp and SABC for example)


I'll combine 2-wire circuits and use 3-conductor cable as much as possible, even if it means one 15a and one 20a circuit.
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In rework I will generally stay with 2 wire to 2 wire to avoid any truobleshooting questions in the future.....not that anything will go wrong....I'm just sayin...
 
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zappy

zappy

Senior Member
Location
CA.
The link you posted.Step five it says to..

The link you posted.Step five it says to..

frizbeedog said:
OK, check this.
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divied the volts with the ohm's to get watts?should that say amps?:confused: How did he get the watts from that?It's late i must be missing something:smile:
 
frizbeedog

frizbeedog

Senior Member
Location
Oregon
zappy said:
divied the volts with the ohm's to get watts?should that say amps?:confused: How did he get the watts from that?It's late i must be missing something:smile:
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Step 5. Determine the power consumed by each appliance: P = E2/R


Hair Dryer: P = 76.82/11.3 = 522 watts
Television: P = 163.22/24 = 1100 watts
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Note that He used E2/R= W or (P)

You must be thinking of E/R=I (amps)

If this is the part your'e thinking of.

Look at your ohm's law wheel. :smile:
 
zappy

zappy

Senior Member
Location
CA.
Where can i get a nice ohm's wheel?

Where can i get a nice ohm's wheel?

frizbeedog said:
Note that He used E2/R= W or (P)

You must be thinking of E/R=I (amps)

If this is the part your'e thinking of.

Look at your ohm's law wheel. :smile:
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Yes that is what i was thinking.So can't you take the amps and x it by the volts to get the watts?
 
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