calculating | Page 6

calculating

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  1. R

    calculating electric cost.

    Quick one. how much does electric cost per hour. I wanna calc how much a 6 spot 300w fitting costs to run for a day. Im thinking of converting to LEDS just want a comparison. thanks
  2. M

    calculating amount of lighting needed?

    hey guys, i need to floodlight a practice green at my dads golf course, just need a bit of advice on how much lighting will be needed! the area is about 2000m2 and obviously needs to be fairly bright, the lights will be elevated on poles. i was thinking maybe 6 x 500w metal-halide fittings...
  3. S

    calculating phase to phase voltage

    For example, one phase is having 90v & other is having 70v, what will be phase to phase voltage & how we will calculate it manually?
  4. M

    calculating main tail size?

    My question is on calculating the total load allowed on different main tail sizes. I have asked my colleagues and fellow students the same question, and got different answers. What is your opinon, do you follow the regs to the book by calculating the total current demand and apply diversity? Or...
  5. D

    calculating lux levels

    Hope you lighting designers out there can help. As anyone used the Thorn CalcExpress. Its very good and easy to use but I can"t find a way to add a reflector to the fitting /calculation.If anyone would like to try I"m using standard twin 70 w Batten with wide reflector. Thanks Daisy. Sorry...
  6. S

    calculating total load on a consumer unit

    this probably is a daft question and the answer maybe staring me in the face, but im going to have to ask. ive got a 32A ring for kitchen, 32A ring for rest of flat, 45A mcb for shower, 16A for boiler, 6 A for lights, 16A for cooker = 147A i have a bs1361 100A main incoming fuse. Would i have...
  7. S

    calculating pscc

    i'm currently studying for the 2391 exam and have been asked on a mock exam paper to calculate the pfc and pscc of an installation. Its a 3phase system supplying circuits of 400/230v 50hz with a Ze value of 0.2ohms. I know the calculation for pfc = V/Ze but how do you work out the pscc. Its my...
  8. J

    Calculating Maximum permitted cable length with maximum Zs value?

    How do l calculate the maximum cable length for a maximum Zs value? Isn't there also correctional factors to be applied for ambient temperature? :confused:
  9. V

    Calculating current loss in a cable

    Hi all, new here so appologies if this is posted in the wrong section. Also, please bear with me as I am a Mechanical Engineer, not a Electrician/Electrical Engineer. Though I do understand the very basic concepts of electrical circuits and will be able to perform reasonably complex...

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