lighting panel

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Is it not right to say that a panel is sized to calculated load in v/a and then time's 100% or 125% depending on time ran of load? In this case a parking lot lighting panel.

I think you have the basic idea but its the circuits to the parking lights that are figured at 125 not the panel itself.
 
Is it not right to say that a panel is sized to calculated load in v/a and then time's 100% or 125% depending on time ran of load? In this case a parking lot lighting panel.
Start with the supply voltage and your load. If the loads are considered continuous, multiply the load by 1.25, and supply that.
 
Is it not right to say that a panel is sized to calculated load in v/a and then time's 100% or 125% depending on time ran of load? In this case a parking lot lighting panel.
Each load would be calculated at 125% if these load are feeding parking lot lights. The sum of the loads must not be greater than the panelboard.

Article 215.2 states

215.2 Minimum Rating and Size.
(A) Feeders Not More Than 600 Volts.
(1) General. Feeder conductors shall have an ampacity not less than required to supply the load as calculated in Parts III, IV, and V of Article 220. The minimum feeder-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity not less than the noncontinuous load plus 125 percent of the continuous load.

I take this to mean that the panelboard feeder must be sized to carry the load as a 125% continuous load. Thus if the loads equal 100 amps then the feeder must be sized for 125% of 100 amps or 125 amps.

I think I have that right.
 
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I take this to mean that the panelboard feeder must be sized to carry the load as a 125% continuous load. Thus if the loads equal 100 amps then the feeder must be sized for 125% of 100 amps or 125 amps.

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Provided the 100 amps does not include any 125% continuous load adjustment. In other words, the 125% continuous load factor is only applied once to a particular load for whatever purpose, whether it be to determine the conductr size for a branch circuit, feeder, or service.
 
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