#### mannyb

##### Senior Member
If i have 150' of track light to put on load calculation do i just use the linear footage of track 150' x 150VA x 1.25 / 2 = 14063VA for calculation

If I wanted to power the track lights and my available power is 20a 277v circuit. I would need 14063 / 5540 = 2.5 or 3 circuits??

does this look correct? or is there something else that would determine how many circuits I would need or not need?

#### xformer

##### Senior Member
If i have 150' of track light to put on load calculation do i just use the linear footage of track 150' x 150VA x 1.25 / 2 = 14063VA for calculation

If I wanted to power the track lights and my available power is 20a 277v circuit. I would need 14063 / 5540 = 2.5 or 3 circuits??

does this look correct? or is there something else that would determine how many circuits I would need or not need?
IMHO,
150' track light = 150/2 = 75

75 x 150VA x 125%= 14063 VA service load

Branch Circuit Load depends on layout, actual number of fixtures on the track, and manufacturer specifications.

#### mannyb

##### Senior Member
IMHO,
150' track light = 150/2 = 75

75 x 150VA x 125%= 14063 VA service load

Branch Circuit Load depends on layout, actual number of fixtures on the track, and manufacturer specifications.
OK sounds good. thanks

#### victor.cherkashi

##### Senior Member
see 220.43(B). I believe you don't have to calculate the branch circuit based on 150VA. you should use 150 VA for feeder total load size that effects your panel size.

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#### ritelec

##### Senior Member
see 220.43(B). I believe you don't have to calculate the branch circuit based on 150VA.
Then how would you calculate the track circuit(s) ?

#### victor.cherkashi

##### Senior Member
Then how would you calculate the track circuit(s) ?
I just summarize wattage of all fixtures on the track. Or I go by maximum wattage permitted by energy code for the area where track is installed. For most of occupancies it should be less than 1w/sq.ft.

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#### ritelec

##### Senior Member
I just summarize wattage of all fixtures on the track. Or I go by maximum wattage permitted by energy code for the area where track is installed. For most of occupancies it should be less than 1w/sq.ft.

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Yes. I see 410.151(B) you can load the track to 100% of the track rating and apparently the branch circuit having a rating not more than that of the track. So.... It sounds like you can make that track as long as you want to make it and load it to its max amperage @ 100%. I don't see it referring back to continuous duty @ 80%. Is it assumed that the load is should be rated to 80% commercially and that's why there's no limitation residentially?