Unusual Question - Powering a single phase panel with 120 Volts

[Besoeker]

IG is Independent Ground, which uses an insulated EGC which runs all the way back to the main bonding jumper location without interconnecting with other wire or raceway EGCs. In theory this will reduce coupling of voltage offsets into patient-facing metal surfaces when leakage or fault currents flow through the other EGCs.

POS equipment is, in other contexts, Piece of S... equipment, but here is more likely Point Of Sale equipment such as cash registers and ordering systems.

Arrogant Yank here!​

And you are not a Yank, arrogant or otherwise, if you are from the Mason-Dixon line.
Remind me of where CA is?

 

[GoldDigger]

And you are not a Yank, arrogant or otherwise, if you are from the Mason-Dixon line.
Remind me of where CA is?

CA is west of the Mason-Dixon Line and has parts both North and South of that line segment. It was, IIRC, not yet a state when the line was drawn.

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[Jraef]

I don't think of someone west of the mississip as a yank. What say you brit? Is anyone in the states a yank?

And you are not a Yank, arrogant or otherwise, if you are from the Mason-Dixon line.
Remind me of where CA is?

California was fought over in Congress and entered the US as a "Free" state in 1850 (a decade before the war broke out) even though the majority of the land mass was technically below the Mason-Dixon line (if it were to be extended that far west). It's actually a major issue that angered the Southern States. In 1861 right before the war broke out there was a move to split California into two states at an extension of the line, which would have put the split somewhere north of Sacramento, meaning almost ALL of the known gold fields would be in SoCal. The Arizona Territory, which at the time included what is now Utah, was actually part of the Confederacy as a result of the same movement and slavery was allowed as part of the Compromise of 1860. Fears that California would split and there would be a Confederate state in the California gold fields that might serve to finance the Confederacy led to Alcatraz Prison starting out life as a Union fort, armed with cannon to guard the Golden Gate from Confederate ships.

We are "Yanks".

 

[Besoeker]

California was fought over in Congress and entered the US as a "Free" state in 1850 (a decade before the war broke out) even though the majority of the land mass was technically below the Mason-Dixon line (if it were to be extended that far west). It's actually a major issue that angered the Southern States. In 1861 right before the war broke out there was a move to split California into two states at an extension of the line, which would have put the split somewhere north of Sacramento, meaning almost ALL of the known gold fields would be in SoCal. The Arizona Territory, which at the time included what is now Utah, was actually part of the Confederacy as a result of the same movement and slavery was allowed as part of the Compromise of 1860. Fears that California would split and there would be a Confederate state in the California gold fields that might serve to finance the Confederacy led to Alcatraz Prison starting out life as a Union fort, armed with cannon to guard the Golden Gate from Confederate ships.

We are "Yanks".

Or septics according to one of my guys - sort of pseudo Cockney rhyming slang.
Anyway, thank you for the history lesson but we are rather wandering off topic and that often doesn't sit well with the mods don'tcha know.....

 

[GoldDigger]

Or septics according to one of my guys - sort of pseudo Cockney rhyming slang.
Anyway, thank you for the history lesson but we are rather wandering off topic and that often doesn't sit well with the mods don'tcha know.....

To quote Alfred E. Neuman, "What, me worry?"

 

[brantmacga]

Unusual Question - Powering a single phase panel with 120 Volts

IG is Independent Ground....

Typically called “isolated” ground..... you’ll see either an orange receptacle with a green triangle, or any other color receptacle with an orange triangle on the face.


Coincidentally, I did a service call yesterday at a bank involving some IG circuits without power. I opened the panel checking breakers and found this ..... this is pretty common for me to find, and certainly not how you do an IG;

They taped the “IG” grounds black, and connected them to this ground bar in a sub-panel. They also connected this ground to the bonding jumper at the device box, which is also incorrect.

They should have been connected to a lifted ground bar, and as this is #12, it should’ve had a tracer stripe in the insulation instead of tape.



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[ike5547]

Typically called “isolated” ground.....

They should have been connected to a lifted ground bar . . .




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Okay, I'm gonna be the sacrificial dumb guy and ask you what this is. A "lifted ground bar"? We used to just run them all the way back to the service isolated through any intervening sub-panels. No one seems to want them (isolated ground circuits) anymore.

 

[ike5547]

Deleted duplicate

 

[GoldDigger]

Okay, I'm gonna be the sacrificial dumb guy and ask you what this is. A "lifted ground bar"? We used to just run them all the way back to the service isolated through any intervening sub-panels. No one seems to want them (isolated ground circuits) anymore.

A "lifted ground bar" is a bar which is insulated from the neutral and from the normal EGC and the enclosure metal. That is, it has been "lifted" away from ground. If you use an accessory ground bar for this purpose you might have to modify it to remove contact with the enclosure. Or you can use a neutral bar, which is normally insulated, and designate it for Isolated Ground instead.

It is arguable whether the code allows this sort of combining of isolated ground anywhere downstream of the main panel, though.

 

[brantmacga]

I’ve yet to find a manufacturer that doesn’t offer isolating blocks for the ground bar; it’s basically a neutral bar.

Also, you don’t combine IG’s and EGC’s. EGC still bonds to the can. That picture above just shows how to not do it.

Our customers typically want a sub-panel for IG circuits. So you have a grounding bar and an isolated bar. Each conduit gets both an EGC and IG ground.


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[jap]

I’ve yet to find a manufacturer that doesn’t offer isolating blocks for the ground bar; it’s basically a neutral bar.

Also, you don’t combine IG’s and EGC’s. EGC still bonds to the can. That picture above just shows how to not do it.

Our customers typically want a sub-panel for IG circuits. So you have a grounding bar and an isolated bar. Each conduit gets both an EGC and IG ground.


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In which case , if metal conduit is used, is one more conductor pulled than needed.


JAP>

 

[brantmacga]

In which case , if metal conduit is used, is one more conductor pulled than needed.


JAP>

Can’t remember the last time I did a job the engineer did not specify EGC’s in metallic conduit ..... it’s pretty much SOP on every single job I’ve seen for the last 15 years


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[AdamTeeScott]

There is a 30 amp 120 volt feed and I need two 20 amp 120 volt circuits powered through this feed.
...
I need a means of disconnect and the items are both required to be on a 20 amp max disconnect per the manufacturer.

So, any reason a 20/20 tandem breaker won’t work?
#keepitsimple

 

[LarryFine]

So, any reason a 20/20 tandem breaker won’t work?

Can't share a grounded conductor.

 

[jap]

Can’t remember the last time I did a job the engineer did not specify EGC’s in metallic conduit ..... it’s pretty much SOP on every single job I’ve seen for the last 15 years


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Yep.

We're all victims of those who don't know any better.

JAP>