Anyone recognize these symbols?

Status
Not open for further replies.
J

Jim_SWFL

Member
Location
Fort Myers, FL
Please see inserted image from a set of plans created in 1974. I perceive the items in question (indicated by red arrows) are overload control using a current transformer. I don't think these are anything exotic, just a symbol I haven't seen before.

I would like to know what these are prior to my site visit next week.

The text in the device might be "CF", "CR", or "GR"?

Thanks for any help.

Hyatt Symbols.jpg
 
Being that it is on a 1600A breaker and a 2500A switch, I wouldn't imagine it's anything other than GF for Ground fault, a requirement on devices that size. Why it's on the 400A breaker is likely just the Egnineer's preference..
 
Jraef said:
Being that it is on a 1600A breaker and a 2500A switch, I wouldn't imagine it's anything other than GF for Ground fault, a requirement on devices that size. Why it's on the 400A breaker is likely just the Egnineer's preference..
Click to expand...

I have to think back to the GF requirements in the early 70's.

This is a '6-disconnect' type of service. The 400A device is one of 3 'main devices', so maybe the they wanted GF on all service devices when the service size was >1200A.
 
Ingenieur said:
:happyyes:

that is the symbol for a 0 seq type ct
Click to expand...

Maybe in your world, but not in mine.

That symbol is what I have used, for more than 40 years, on 'building construction style' one-lines to indicate any CT, without regard to purpose or quantity. For more specific information you would need to look at the specific equipment one-lines and three-lines.
 
Status
Not open for further replies.
Top