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Power System Engineer
- Location
- Las Vegas, Nevada, USA
- Occupation
- Licensed Electrical Engineer, Licensed Electrical Contractor, Certified Master Electrician
I'm working through Annex D Example D2(b) and need help understanding why a 55% demand factor is being applied to "Two-4kVA ovens plus one 5.1-kVA cooking unit".
Clearly the 55% demand factor applies to Table 250.55, note 3. However consider that Table 250.55, note 4 states, "The branch-circuit load for a counter-mounted cooking unit and not more than two wall-mounted ovens, all supplied from a single branch circuit and located in the same room, shall be calculated by adding the nameplate rating of the individual appliances and treating this total as equivalent to ONE range."
Consider the example does not specify whether this equipment is or is not on a single branch circuit or located in the same room. The conservative approach is to apply note 4 but to get the minimum calculated load we would use note 3. Any insight on how to make sense of this is appreciated. Thanks in advance.
Clearly the 55% demand factor applies to Table 250.55, note 3. However consider that Table 250.55, note 4 states, "The branch-circuit load for a counter-mounted cooking unit and not more than two wall-mounted ovens, all supplied from a single branch circuit and located in the same room, shall be calculated by adding the nameplate rating of the individual appliances and treating this total as equivalent to ONE range."
Consider the example does not specify whether this equipment is or is not on a single branch circuit or located in the same room. The conservative approach is to apply note 4 but to get the minimum calculated load we would use note 3. Any insight on how to make sense of this is appreciated. Thanks in advance.
