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ConEd 480 or 460?

Merry Christmas
R

Rock86

Senior Member
Location
new york
Occupation
Electrical Engineer / Electrician
Is anyone familiar with ConEd requirements in lower New York? Do they provide 480V or 460V? We have a client who is having a lot of trouble with voltage dips causing issues on HVAC equipment because they have 460V coming into the building. The primary transformer says 480V/277, but that is not what we are reading.

I recently metered the system for a month, and there are a lot of fluctuations in the voltage. If anyone would like to see the results, feel free to ask. I am always happy to hear others opinions.
 
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SceneryDriver

Senior Member
Location
NJ
Occupation
Electrical and Automation Designer
When we moved our shop two years ago, we discovered that the building we moved to had a service tapped for 460V. When the voltage would sag under heavy loads, our CNC machines would sometimes fault on low voltage. After much back and forth with PSE&G, they finally came out, did a full building shutdown at the pole, and changed the tap on the transformer. The paperwork took months. The actual work took less than 5 minutes.

Do you have a padmount transformer or pole pigs? The padmounts seem to be much easier for the POCO to retap and adjust.



Scenerydriver
 
R

Rock86

Senior Member
Location
new york
Occupation
Electrical Engineer / Electrician
SceneryDriver said:
When we moved our shop two years ago, we discovered that the building we moved to had a service tapped for 460V. When the voltage would sag under heavy loads, our CNC machines would sometimes fault on low voltage. After much back and forth with PSE&G, they finally came out, did a full building shutdown at the pole, and changed the tap on the transformer. The paperwork took months. The actual work took less than 5 minutes.

Do you have a padmount transformer or pole pigs? The padmounts seem to be much easier for the POCO to retap and adjust.



Scenerydriver
Click to expand...
I actually had issues recently PSE&G with a 460V service. They wanted to charge the client $70k to change the transformer because it was from 1986 and didn't have a way to change the taps.

The client we have in Westchester has a padmount transformer. It even says 480/277 on the side., but that is not what they are getting.
 
S

SceneryDriver

Senior Member
Location
NJ
Occupation
Electrical and Automation Designer
Rock86 said:
I actually had issues recently PSE&G with a 460V service. They wanted to charge the client $70k to change the transformer because it was from 1986 and didn't have a way to change the taps.

The client we have in Westchester has a padmount transformer. It even says 480/277 on the side., but that is not what they are getting.
Click to expand...
Our building's transformer had a built-in tap changer. Once they had the power off at the pole by pulling the cutouts, they just had to rotate a dial. It was like setting the cycle on your clothes dryer. I had no idea it could be that easy. I thought they'd be moving cables to different taps or something.

$70k is nuts! PSE&G always try to make it the customer's problem. The trick is getting someone with half a brain - the low level drones who answer the phone are not exactly empowered to help anyone with anything.


SceneryDriver
 
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