Electrician Talk banner

1 - 13 of 13 Posts

·
Registered
Joined
·
12,412 Posts
So I had to install a few receptacles for new cash wraps in the Macy's in Paramus NJ. (built 1956) They call for isolated ground dedicated to the nearest panelboard. Well heres the nearest panelboard. I'm not seeing an isolted grounding bus...
Describe, to us what you believe an "isolated" ground is.
 

·
Registered
Joined
·
106 Posts
Discussion Starter #4
Cut the ground off! Doesnt get much more isolated that that lol. JK I run a separate ground out of the transformer and then carry that "isolated" ground to each additional panelboard fed off that transformer. I've done jobs where I had to install an isolation transformer to supply a panel dedicated to computer power. In the case of this job we decided isolated ground wasnt the most important thing for their cash registers and went with good ol standard white receptacles.
 

·
Ambassador of Amps
Joined
·
9,518 Posts
run a separate ground out of the transformer and then carry that "isolated" ground to each additional panelboard fed off that transformer.

Thats how its supposed to be done. its all snake oil regardless.
 

·
Fond of three phase
Joined
·
1,649 Posts
So I had to install a few receptacles for new cash wraps in the Macy's in Paramus NJ. (built 1956) They call for isolated ground dedicated to the nearest panelboard. Well heres the nearest panelboard. I'm not seeing an isolted grounding bus...
I don't believe that panelboard is from 1956! More like 1946. Why would they use 250 volt cartridge fuses. It's just as easy to overfuse the circuit.
 

·
Registered
Joined
·
106 Posts
Discussion Starter #7
The panels are pretty cool, they have em throughout the store. I like the toggle switches built in, this is how they would shut the lights off each day before they had a lighting control system. The key switches I guess were for the 24/hr power so that somone wouldnt shut down receptacles or EM lights by accident. The system does seem antiquated for 1956 but its definately when the the place was built. In some othere areas of the building they have the real old style cutler-hammer "multi breaker" panels which I have only ran into once or twice on jobs. I'd love to see the threshold those things trip at.
 

·
Electric Al
Joined
·
4,823 Posts
I don't believe that panelboard is from 1956! More like 1946. Why would they use 250 volt cartridge fuses. It's just as easy to overfuse the circuit.
I agree that these style panels are more than likely late 40s early 50s.

I see what seems to be a few key operated toggles in there too .

Are am I wrong ? images.jpg

I have seen panels like this in older churches .
 

·
Salty Member
Joined
·
31,081 Posts
I run a separate ground out of the transformer and then carry that "isolated" ground to each additional panelboard fed off that transformer.
That is how it should be, or if there are no transformers in the building back to the bonding point at the service disconnect.
 

·
Salty Member
Joined
·
31,081 Posts
So I had to install a few receptacles for new cash wraps in the Macy's in Paramus NJ. (built 1956) They call for isolated ground dedicated to the nearest panelboard. Well heres the nearest panelboard. I'm not seeing an isolted grounding bus...
Run it IG to the nearest panel board and land it there. You have met what they are calling for.
 

·
animal lover /rat bastard
Joined
·
13,547 Posts
I did similar a month or two ago. Macy's IT guy told me they had problems with cash register on same ckt as general purpose for the hand scanners and other items at the cash wraps, so they wanted "clean" ckt for cash register. I'm guessing the problem has more to do with antiquated servers and the 10baseT network the registers are on, but who knows. The plans I had only showed a dedicated, not IG, but I home runned back to panel with IG anyway. Same old story as most of these retailers, only a few we have worked for have installed the one isolated transformer on new installations for the IG's like Bob was talking about.
 
1 - 13 of 13 Posts
Top