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Load Calculations for 400v single phase floodlighting

seansasta
Hi Folks

Could someone please advise if my calculations below are correct? I'm calculating total load on a 3 phase 400v system for a floodlighting load consisting of 36 No 400v single phase ("2-phase") Luminaires. I thought my calc's were correct then I read some other posts online which used 3 phase formula (as if the stated lighting load was 3 phase) which left me with enough doubt in my calc's to seek some expert advice from you guys...

Supply: 3ph/400V

Load: 36No Philips OPTIVISION MVP507 1xMHN-LA2000W/400V/842 WB/60, with a stated load of 2123 W each, equally divided across the 3 phases, (I have assumed a Pf of 0.9 for the ballasts).

I have treated these as single phase loads, therefore...

I total = (2123*36)/(400*0.9) = 212.3A; divided equally across 3 phases = 71 A (70.77) line current

Therefore, (Assuming I used the correct calculations above) total 3 phase power in KW = ((400*1.732*0.9*71)/1000) = 44.27 KW


Any confirmations or corrections would be greatly appreciated.


Thanks

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  • 0
    Thanks for your response John


    This project has been on the go for over a year now while the club is raising funds to get started and I'm trying to get the client to push to LED fittings but when we last budget costed it around a year ago the capital outlay for the LED equivalent was cost prohibitive. I will give an LED option again this time around as the area to be lit has reduced a bit from previous proposals but their other concern is the effect on foundation size (read cost) as the wind loading on LED fittings would be greater. Is there any other maintenance requirements for LED apart from lens cleaning? I gather the drivers for the LED are enclosed in the fittings, if so that's another big advantage over separate kiosks required for HID control gear? While I'm here...do you know if there is a maximum recommended distance from the control gear for 2000w metal halide lamp to the fitting (which has an integral ignitor)? and does this flexible cable need to be taken into account for volt drop? Looking at putting some of the kiosks about 25m away from the base of 18m poles here.
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  • 0
    Thanks for your response John


    This project has been on the go for over a year now while the club is raising funds to get started and I'm trying to get the client to push to LED fittings but when we last budget costed it around a year ago the capital outlay for the LED equivalent was cost prohibitive. I will give an LED option again this time around as the area to be lit has reduced a bit from previous proposals but their other concern is the effect on foundation size (read cost) as the wind loading on LED fittings would be greater. Is there any other maintenance requirements for LED apart from lens cleaning? I gather the drivers for the LED are enclosed in the fittings, if so that's another big advantage over separate kiosks required for HID control gear? While I'm here...do you know if there is a maximum recommended distance from the control gear for 2000w metal halide lamp to the fitting (which has an integral ignitor)? and does this flexible cable need to be taken into account for volt drop? Looking at putting some of the kiosks about 25m away from the base of 18m poles here.
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