Singe Phase Panel

[anbm]

If an electrical panel does not have manufacturer name label indicates voltage, phase, etc. by just looking panel breakers, can we tell if the panel is singe- phase? (assume there are no 3-pole breakers exist).

Or do we have to open the panel front cover to see the incoming wires and can decide???

 

[Dennis Alwon]

One could not be certain if this is a typical load center so opening the cover or looking at the breaker that feeds it would usually tell you.

 

[drbond24]

I just spent 3 days in an OSHA 30 hour class, so I can tell you that having no label would be an OSHA violation.

 

[480sparky]

I just spent 3 days in an OSHA 30 hour class, so I can tell you that having no label would be an OSHA violation.

I can see where it may be an NRTL listing/labeling issue, but OSHA? Why would OSHA care about the lack of a label in the panel of my house?

 

[drbond24]

I can see where it may be an NRTL listing/labeling issue, but OSHA? Why would OSHA care about the lack of a label in the panel of my house?

I don't know that they would care about your house. They don't like it at work, though.

 

[LarryFine]

Or do we have to open the panel front cover to see the incoming wires and can decide???

With no 3p breakers, that's about the only option, unless you go outside (or whereven the meter is.)

Now, if we're laking about a subpanel, no for sure (unless you can find its feeeder's origination point.)

 

[chris kennedy]

Having a 3 pole breaker in a panel in not a clear indication its really a 3? panel. Open it up and look at the buss arrangement.

 

[LarryFine]

Having a 3 pole breaker in a panel in not a clear indication its really a 3? panel. Open it up and look at the buss arrangement.

I presumed (I know, I know*) the breaker to have been installed by a qualified someone.

Besides, he did include not opening the panel as a parameter.


* When you presume, you make a pre of u and me.



Added: I guess one could have equipment that requires both 240v and 120v supplies.

 

[gadfly56]

I presumed (I know, I know*) the breaker to have been installed by a qualified someone.

Besides, he did include not opening the panel as a parameter.


* When you presume, you make a pre of u and me.



Added: I guess one could have equipment that requires both 240v and 120v supplies.

What if you had a MWBC on three breakers with a handle tie?