What is the demand load on the feeder for 1-14 kw 240 volt single-phase range installed in a dwelling unit?
Solution:
To answer this question correctly we need to know what the term demand as used in the code really means. The term demand always refers to a reduction from connected load. Which means that in this case the connected load or the nameplate rating is 14 kW and we need to reduce that rating by applying the appropriate code rules.
Refer to Table 220.55, Column C and Note #1 in the National Electrical Code.
Step One:
Subtract the cutoff rating for Column C from the nameplate rating or connected load of the range.
14 kW -12kW = 2 kW difference.
Step Two:
Use the kW difference to increase 5% per Note #1 of Table 220-55.
Increasing 5% by 2kW turns 5% into 10%.
Step Three:
Increase the kW demand value for 1 range in Column C by 10%.
8 kW increased by 10% = 8.8 kW demand-Final answer.
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