I have a 4 gang box with 2 cicuits inside. 1 circuit is 120V. One circuit is 277V. There are 3 switches at 277V and 1 switch at 120V. The box is in a poured concrete wall and I am trying to still be able to use this box for these switches obviously because putting another switch in that wall would be quite a task. Any suggestions would be very helpfull. Thanks, Justin
404.8(b)?
- Thread starter justin
- Start date
- Status
bphgravity
Senior Member
- Location
- Florida
Re: 404.8(b)?
Many boxes come equipped with barriers that can be permanently installed. If your box does not, you are pretty much out of luck.
Many boxes come equipped with barriers that can be permanently installed. If your box does not, you are pretty much out of luck.
Re: 404.8(b)?
justin,
If you have to use that location,then get a relay&enclosure with coil voltage at 277vac,change out the 120vac switch to 277vac switch to control the relay,put your original switch wires on the N.O. contacts of the relay.
Now all the switches are the same voltage same phase.
frank
justin,
If you have to use that location,then get a relay&enclosure with coil voltage at 277vac,change out the 120vac switch to 277vac switch to control the relay,put your original switch wires on the N.O. contacts of the relay.
Now all the switches are the same voltage same phase.
frank
marinesgt0411
Senior Member
- Location
- Naples,FL 34110-9285
Re: 404.8(b)?
you can get dividers for a masonary box that have two pins that fit into the holes in the back of the box and slide into the notch between the switch locations. check your RACO catalog
Are the 277volt switches on the same circuit if not you will need to divide between them also.
you can get dividers for a masonary box that have two pins that fit into the holes in the back of the box and slide into the notch between the switch locations. check your RACO catalog
Are the 277volt switches on the same circuit if not you will need to divide between them also.
Re: 404.8(b)?
Justin, we use the items mentioned by Marinesgt0411 on a regular basis in hospitals to separate Normal and Critical branches in one box.
Click here for the partitions for different boxes
Roger
Justin, we use the items mentioned by Marinesgt0411 on a regular basis in hospitals to separate Normal and Critical branches in one box.
Click here for the partitions for different boxes
Roger
buck33k
Senior Member
- Location
- Washington state and North Carolina
Re: 404.8(b)?
Would Justin's installation be a violation? The voltage between devices does not exceed 300 volts.
He has one phase at 277 and one at 120.
[ August 03, 2005, 11:47 PM: Message edited by: buck33k ]
Would Justin's installation be a violation? The voltage between devices does not exceed 300 volts.
He has one phase at 277 and one at 120.
[ August 03, 2005, 11:47 PM: Message edited by: buck33k ]
- Location
- Windsor, CO NEC: 2017
- Occupation
- Service Manager
Re: 404.8(b)?
Is it a violation to have a seperately derived system in the same box?
How would the 120V and 277V systems read if you applied a meter to it?
Is it a violation to have a seperately derived system in the same box?
How would the 120V and 277V systems read if you applied a meter to it?
buck33k
Senior Member
- Location
- Washington state and North Carolina
Re: 404.8(b)?
George
I do'nt know the answers to your questions, but I think any phase to phase reading over 300 volts would be a violation of 404.8(B). For example, two phases of a 480/277V system in the device box for 277V switches.
Buck
George
I do'nt know the answers to your questions, but I think any phase to phase reading over 300 volts would be a violation of 404.8(B). For example, two phases of a 480/277V system in the device box for 277V switches.
Buck
- Location
- Massachusetts
Re: 404.8(b)?
No.
Originally posted by georgestolz:
How would the 120V and 277V systems read if you applied a meter to it?
- Location
- Windsor, CO NEC: 2017
- Occupation
- Service Manager
Re: 404.8(b)?
Good to know!
Good to know!
- Status