ptonsparky
Tom
- Occupation
- EC - retired
What is the maximum distance the overcurrent protection for a delta wye secondary be. Industrial. NEC 2011. ! 25? 50? Reference? 75 kva.
secondary protection
- Thread starter ptonsparky
- Start date
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- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
The starting point for this situation is that the OCPD has to be right at the secondary terminals. That is, it must be there unless you meet one of the conditions listed in the code, and then you can have it at a distance that is associated with that condition. Take a look at 240.21(C).
To that I will add that for most of the installations that I design, I put a panel with a main circuit breaker within 10 feet of a step-down transformer, in accordance with 240.21(C)(2).
To that I will add that for most of the installations that I design, I put a panel with a main circuit breaker within 10 feet of a step-down transformer, in accordance with 240.21(C)(2).
ptonsparky
Tom
- Occupation
- EC - retired
The most I could find was 25'. We were at 32. Cheaper to move it than pay for wire. Now at 10'..
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