Dale001289
Senior Member
- Location
- Georgia
The client wants a shunt trip on all 20A molded case circuit breakers for panelboard. This seems very unusual to me - not sure what the typical application would be for this?
Shunt trip for 20A branch CBs?
- Thread starter Dale001289
- Start date
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
That's something we would ask you.
What is the application? Restaurant kitchen? Gas pumps?
I'd look at a single shunt-trip main instead.
What is the application? Restaurant kitchen? Gas pumps?
I'd look at a single shunt-trip main instead.
Dale001289
Senior Member
- Location
- Georgia
Thanks.
This is an industrial plant—waste water treatment—and I don’t see the need for rapid shutdown of any equipment here.
Since this is a very old plant and specification maybe it’s something they liked 70 years ago? But not very applicable today.
This is an industrial plant—waste water treatment—and I don’t see the need for rapid shutdown of any equipment here.
Since this is a very old plant and specification maybe it’s something they liked 70 years ago? But not very applicable today.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
And what are they using to control these shunt trips? A separate control for every circuit breaker?
Its so the PLC can shut the load down and force a manual reset.
Dale001289
Senior Member
- Location
- Georgia
Could be - but for future
Because at this point there is no PLC. the plant is antiquated and everything is hardwired with relays
Dale001289
Senior Member
- Location
- Georgia
Great question. I’ll check into next week
Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
Why not get a main shunted CB
Buck Parrish
Senior Member
- Location
- NC & IN
Then the wifi and hvac would go off
Sberry
Senior Member
- Location
- Brethren, MI
- Occupation
- farmer electrician
I am very rural and bout the only time I have seen them is connected to Ansul. One on the man would shut the coolers and the music off too.
Sberry
Senior Member
- Location
- Brethren, MI
- Occupation
- farmer electrician
I forgot about gas pumps. I knew I had seen some on 20 but couldn't recall where.
Rajun Cajun
Member
- Location
- upstate SC
The audio visual folk have whole panelboards with that.
Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
Good point. Would have to have a designated panel with all emergency off circuits separated.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Usually with the gas pumps and canopies, they have an auxiliary contact on the breaker to disconnect the neutral too.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
The OP said, "The client wants a shunt trip on all 20A molded case circuit breakers for panelboard."
Only later did we find out that there are exceptions, so individual circuits, not all.
Just how many, and should they all trip for the same single cause, which is what?
We ask for these details so we can answer you as closely to the situation as we can.
Only later did we find out that there are exceptions, so individual circuits, not all.
Just how many, and should they all trip for the same single cause, which is what?
We ask for these details so we can answer you as closely to the situation as we can.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I don't believe a E-stop operation would be required to open the grounded conductor. You could still have a "fuel panel" with shunt trip main or feeder breaker and still have switched neutral breakers on branch circuits where needed. I think many fuel control systems have input leads for an E-stop button and it just locks out the controls if stop is pushed and never shuts off any branch circuit breakers.