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  1. PA28

    Lighting Arrester should be after or before the cutout fuse (which protects the pole mounted XMR)

    Just wandering what will happen if the LA fails as a short circuit. At low voltage levels we always use a fuse to isolate the defective surge protection devices.
  2. PA28

    TPN MCCBs

    Properly designed packaged type equipment generally do not need the neutral. The control voltage is derived inside with a control transformer with line to line input. This less troublesome than using neutral.
  3. PA28

    Can coal dust causes arc-flash?

    I am not sure it is correct to seek information not directly relevant to topic. But i am inclined to request information on pressurizing the electrical room indicated by Waross's reply. We are struggling with a contractor to setup one, the contractor is clueless and we also do not have any...
  4. PA28

    PLC Output Module

    Thank you for the suggestions by ScottyUK GroovyGuy. All the starters are with individual control transformers which can be kept floating, but connecting them through the PLC, i think is not good. Therefore providing a bank of interposing relays, should be in a separate compartment with...
  5. PA28

    PLC Output Module

    Thank you. thebard3. Yes BMX DRA 0805 is with completely isolated outputs. Only 8 outputs per module, and therefore more cost per output. But it solves the problem.
  6. PA28

    PLC Output Module

    Dear friends, Our contractor is proposing to use the BMXDRA1605 (Schneider) DO module for controlling some pumps with an MCC. (Please see attachment). From the data sheet i noted that all out puts are supposed to use a power sources with one pole connected together. I think this is not always...
  7. PA28

    Control Logic Diagram

    Hi, Thank you all for your valuable responses. Clearly the drawing is not enough for the programmer, but sufficient for the assessment of the work ahead. I think the use of logic diagram for the drawing is in correct, it should rather be described as P&ID with control overview or something...
  8. PA28

    Control Logic Diagram

    itsmoked, I am sorry for that, i had three diagrams including legend and symbols and could not upload all three. Anyway i am uploading the main file which is generally understandable...
  9. PA28

    Control Logic Diagram

    Hi, I am reviewing a drawing named as "Control Logic Diagram" submitted by a design engineer. (Please see attachment). The drawing (along with other similar drawings) is supposed to be used by SCADA system subcontractor to design the control system. Control logic diagrams i am familiar with...

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