Recent content by AbdullahS

  1. AbdullahS

    What do the symbols on an electrical switch mean?

    Hi All, I am just trying to understand a circuit but cannot figure out the meaning of the following symbol. Did not get very far from googling electrical symbols. The symbol is given below. I know it is a switch but what does "x" mean on one of the wires and what do the half sine and square...
  2. AbdullahS

    Is Replacing a 25 kVAr Unit with Two 12.5 kVAr Units More Efficient?

    Hi all, The power factor correction unit for one of the buildings that I am working on needs maintenance. The service report recommends replacing the existing 25 kVAr unit with 2 x 12.5 kVAr units as "the demand on your site according to the data supplied shows us that at most there is only...
  3. AbdullahS

    Any ideas for how to read this mechanical timer?

    Hi all, just came across this timer while on a site-visit. Any idea how to read this thing? PS: if it is not a right section, please move it to the right one as I was not sure where to post this. Regards, Abdullah
  4. AbdullahS

    Pressure setpoints for a set of pumps (Affininity Laws)

    Hi Guys, The problem I am facing at the moment is to calculate the appropriate setpoint for a set of pumps supplying cold water to a building so that electricity and cost savings can be achieved. Here is the situation: There are three pumps connected in parallel. They are located on the ground...
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