I need help understanding how to use 220.42(B) from the 2023 NEC. What values are you using for the feeder calculations?
For example, if I'm using a power monitoring system with my very low amperage lighting to comply with energy code: I would add up my wattage and use the 125% multiplier without any demand factor adjustments?
220.42 Lighting Load for Non-Dwelling Occupancies.
(A) General.
A unit load of not less than that specified in Table 220.42(A) for non-dwelling occupancies and the floor area determined in 220.5(C) shall be used to calculate the minimum lighting load. Motors rated less than 1⁄8 HP and connected to a lighting circuit shall be considered general lighting load.
(B) Energy Code.
Where the building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated using the unit values specified in the energy code where the following conditions are met:
(1) A power monitoring system is installed that will provide continuous information regarding the total general lighting load of the building.
(2) The power monitoring system will be set with alarm values to alert the building owner or manager if the lighting load exceeds the values set by the energy code. Automatic means to take action to reduce the connected load shall be permitted.
(3) The demand factors specified in 220.45 are not applied to the general lighting load.
(4) The continuous load multiplier of 125 percent shall be applied.
For example, if I'm using a power monitoring system with my very low amperage lighting to comply with energy code: I would add up my wattage and use the 125% multiplier without any demand factor adjustments?
220.42 Lighting Load for Non-Dwelling Occupancies.
(A) General.
A unit load of not less than that specified in Table 220.42(A) for non-dwelling occupancies and the floor area determined in 220.5(C) shall be used to calculate the minimum lighting load. Motors rated less than 1⁄8 HP and connected to a lighting circuit shall be considered general lighting load.
(B) Energy Code.
Where the building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated using the unit values specified in the energy code where the following conditions are met:
(1) A power monitoring system is installed that will provide continuous information regarding the total general lighting load of the building.
(2) The power monitoring system will be set with alarm values to alert the building owner or manager if the lighting load exceeds the values set by the energy code. Automatic means to take action to reduce the connected load shall be permitted.
(3) The demand factors specified in 220.45 are not applied to the general lighting load.
(4) The continuous load multiplier of 125 percent shall be applied.
