In article 695.3, the writers of the code seem to make a distinction between power sources and feeder sources. Has anyone noticed this before and what are the thoughts on this?
The question came up when a group of us were digging deeper into this article for a job we were doing.
We determined that we need multiple sources (695.3.B) since we have an unreliable power source. The code then goes on an describes three possible ways to achieve this.
1)combination of two or more individual sources (695.3.A);
2)combination of feeders constituting two or more power sources as covered in 695.3.B.2;
3)combination of one power source as described above and an on-site standby generator.
When there is no on-site power production facility and having two individual sources cannot be exactly known, point 1 is not available for us to use.
When looking into what a feeder source is in 695.3.B.2, the code describes one power source = two feeder sources.
So according to point 2 above we would need a combination of two or more power sources, so if one power source = two feeder sources, it makes sense that we would need four feeder sources to constitute two power sources, correct?
In point 3, following the same logic, we would need two feeder sources and one on-site standby generator.
In order to achieve both of these we would need 3 or more transfer switches with delays in switching over, which I see as a big mess.
Am I looking at this code correctly?
The question came up when a group of us were digging deeper into this article for a job we were doing.
We determined that we need multiple sources (695.3.B) since we have an unreliable power source. The code then goes on an describes three possible ways to achieve this.
1)combination of two or more individual sources (695.3.A);
2)combination of feeders constituting two or more power sources as covered in 695.3.B.2;
3)combination of one power source as described above and an on-site standby generator.
When there is no on-site power production facility and having two individual sources cannot be exactly known, point 1 is not available for us to use.
When looking into what a feeder source is in 695.3.B.2, the code describes one power source = two feeder sources.
So according to point 2 above we would need a combination of two or more power sources, so if one power source = two feeder sources, it makes sense that we would need four feeder sources to constitute two power sources, correct?
In point 3, following the same logic, we would need two feeder sources and one on-site standby generator.
In order to achieve both of these we would need 3 or more transfer switches with delays in switching over, which I see as a big mess.
Am I looking at this code correctly?
