Application of Lighting Load Demand Factors

[Smart $]

Is any precedence on how to apply lighting load demand factors (Table 220.42) to continuous and noncontinuous loads?

It don't matter when figuring calculated load, but when we get to sizing service and feeder conductors and ocp it could. If we apply the higher demand to noncontinuous portion first, such that the continuous portion is factored at less than 100%, that would be less continuous load requiring the extra 25%.

Of course it don't matter too much regarding dwelling units, as general lighting is considered noncontinuous anyway. It would only make a difference for hospitals, hotels, motels, and warehouses.

Just wondering... ???

 

[m sleem]

Is any precedence on how to apply lighting load demand factors (Table 220.42) to continuous and noncontinuous loads?

It don't matter when figuring calculated load, but when we get to sizing service and feeder conductors and ocp it could. If we apply the higher demand to noncontinuous portion first, such that the continuous portion is factored at less than 100%, that would be less continuous load requiring the extra 25%.

Of course it don't matter too much regarding dwelling units, as general lighting is considered noncontinuous anyway. It would only make a difference for hospitals, hotels, motels, and warehouses.

Just wondering... ???

I have an idea not referenced to code but any way it would work.

For hospital
Apply 220.42 demand for patient rooms (non continuous load)
Take 100% of the general lighting (continuous)

For hotels
Apply 220.42 demand for private rooms (non continuous load)
Take 100% of the general lighting (continuous)

For warehouses
Apply 220.42 demand for storage (non continuous load for none power panel)

For offices
Take 100% of the whole lighting (continuous)

 

[Smart $]

I have an idea not referenced to code but any way it would work.

For hospital
Apply 220.42 demand for patient rooms (non continuous load)
Take 100% of the general lighting (continuous)

For hotels
Apply 220.42 demand for private rooms (non continuous load)
Take 100% of the general lighting (continuous)

For warehouses
Apply 220.42 demand for storage (non continuous load for none power panel)

For offices
Take 100% of the whole lighting (continuous)

That's a sensible approach, given the type of occupancies... the first tier of demand applies to continuous first, being the greater of the demand... leaving the noncontinuous for the greater reduction where the demand is less anyway.

I know it's not stipulated in Code how to apply the demand factors. Someone could effectively shave off some VA when determining ocp and conductor size, by applying demand factors to continuous loads last.