Recent content by megatronic

  1. M

    How to calculat the area covered by light?

    thenk you very much engineers for your discussion it was useful
  2. M

    How to calculat the area covered by light?

    thank you engineers. however the logo dimensions are 30MX30M and at the 10M height, I proposed for 3 poles suitable for mounting on foundation with two floodlights. the power suorce will be taken from the nearest sub station lighting panel rated at 220/127V, 3ph, 4W, 60Hz, and one circuit...
  3. M

    How to calculat the area covered by light?

    Dear engineers, I need to know how to calculat the area of the light that covered by flood light with 400W and supplied with voltage rated at 220-127V current I=20A. for the informatoin that flood light will be fixed on the 10M height pole directed to the company logo on cooling tower to...
  4. M

    I'v quistion on Quadratic Functions

    ya I know to make graph for quadratic
  5. M

    I'v quistion on Quadratic Functions

    Homework Statement Let f(x)= 125x-6x2 find the maximum value of f to four decimal places graphically Homework Equations (x)= 125x-6x2 The Attempt at a Solution Homework Statement attempt solution: x=-b+\sqrt{}b2-4ac/2a x=-125+\sqrt{}1252-4(-6)(0)/2a x= 0/-12=0...
  6. M

    How can we calculate the current (I) if we have cable with 25 mm size for 480V?

    thanx MATLABdude, you are right the cable should be chosen by considering the load and the current carried to the load. however what I meant is the maximum current appropriate for this size of cable.
  7. M

    How can we calculate the current (I) if we have cable with 25 mm size for 480V?

    dear engineer, how can we calculate the current (I) if we have cable with 25 mm size for 480V? and are there any other parameters we should know to calculate the current. (for plant project purpose)
  8. M

    Cable size calculating

    thanks all for your great reply
  9. M

    Cable size calculating

    Dear all engineers, I would like to know the method of calculation the size of the cables, and what the perimeters needed to do this calculation. also, I would like to know how to get the seqmm cable size if we have AWG cable size And vice versa. thank you
  10. M

    How to calculate the BusBar size?

    thank you dlgoff that will help me
  11. M

    How to calculate the BusBar size?

    can any engineer show me how we can calculate the busbar for any distribution panel assum that we have 800A interrupting capacity 50 kA, 320V/220V also, if we make an calculation how can we determain the apprperat busbar. thank you
  12. M

    Needing some help synchroniozing panel

    thank you "brewnog" for your response...... actually, I don't have a specific problem. however, I had a meeting with some engineers in my company and one of thim mentioned these two cases. I didn't understand what did he mean I asked him and his description was similar as what I mentioned...
  13. M

    Needing some help synchroniozing panel

    yes.....I'll clarify my quiry e.g. if we have five generators each on supply one panel and all are running in this case (all generators are in duty case), but if there is a problem occur in one panel the generator supplies this spacific panel will stop and it is become standby generator. I...
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