Genie
New User
- Location
- fremont ca
- Occupation
- electrician
I have some comments and questions about how the 2020 (and previous editions) of the NEC handle the Grounded Conductor Load Calculations
1. In the Example D2(a) and D2(b), the Feeder Neutral Load is adjusted according to table 220.42 and then adds: "In Accordance with 220.61."
I cannot find where in 220.61 it references 220.42. What am I missing? Is it obliquely referring to the unbalanced loads?
2. 220.61 (B)(1) states that before applying 70% demand factor for the feeder neutral, we must use Table 220.55 for ranges and Table 220.54 for Dryers. However, both D.2(a) and D.2 (b) are given as examples of the optional method. I've always been warned away from using tables 220.54 & 220.55 when using the optional method.
Why do the Annex D examples use those tables (in Part III of 220) when using the Part IV optional method. Can someone enlighten me?
1. In the Example D2(a) and D2(b), the Feeder Neutral Load is adjusted according to table 220.42 and then adds: "In Accordance with 220.61."
I cannot find where in 220.61 it references 220.42. What am I missing? Is it obliquely referring to the unbalanced loads?
2. 220.61 (B)(1) states that before applying 70% demand factor for the feeder neutral, we must use Table 220.55 for ranges and Table 220.54 for Dryers. However, both D.2(a) and D.2 (b) are given as examples of the optional method. I've always been warned away from using tables 220.54 & 220.55 when using the optional method.
Why do the Annex D examples use those tables (in Part III of 220) when using the Part IV optional method. Can someone enlighten me?