Reducing short circuit current available?
- Thread starter olc
- Start date
- Status
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
I would likely add a transformer, given the proximity to the service.
Although my preference would be to tell them to supply the correct elevator equipment in the first place.
Although my preference would be to tell them to supply the correct elevator equipment in the first place.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Have you checked whether they provide different SCCR ratings for different types of upstream overcurrent protective devices?
Another possibility is to coil up added feeder length in, say, a 24x24 pull box.
Another possibility is to coil up added feeder length in, say, a 24x24 pull box.
Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
Everything line side of the elevator connection is rated OK. We provide feeder circuit breaker and fused disconnect at the elevator.
They want the low SCCA at the line side of the disconnect.
I don't think the elevator company will change their equipment. Getting any information out of them (before the elevator is actually ordered) is like pulling teeth.
Schindler - The SCCR rating of elevator equipment is 5000 Amps, contractor to ensure that the available fault current of the building supply at the service switch does not exceed this value (Per NFPA 70). (we provide the service switch which can have the high SCCR - so I assume they mean load side)
Otis - Elevators supplied to this document are rated at 10,000 Amps RMS Symmetrical Short Circuit Current (SCCR).
Yes - I can calculate the length of wire required to lower the SCCA. In my current example I would need 63 ft. (The elevator feeder would normally be 25 feet or less - the service/panelboard and elevator are in the same room.)
They want the low SCCA at the line side of the disconnect.
I don't think the elevator company will change their equipment. Getting any information out of them (before the elevator is actually ordered) is like pulling teeth.
Schindler - The SCCR rating of elevator equipment is 5000 Amps, contractor to ensure that the available fault current of the building supply at the service switch does not exceed this value (Per NFPA 70). (we provide the service switch which can have the high SCCR - so I assume they mean load side)
Otis - Elevators supplied to this document are rated at 10,000 Amps RMS Symmetrical Short Circuit Current (SCCR).
Yes - I can calculate the length of wire required to lower the SCCA. In my current example I would need 63 ft. (The elevator feeder would normally be 25 feet or less - the service/panelboard and elevator are in the same room.)
- Status