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  1. Padlock01

    What Are the Biggest Challenges in Schematic Design for Industrial and Construction Projects?

    Hi Karlour The number of schematics depends on the type of circuit. For example, DOL, Star/Delta, Soft starters, VSDs, feeders, Incomers, etc., create typical. The time spent on schematics depends on whether or not you have master schematics. If not, say with a good CAD operator, say 5 hours per...
  2. Padlock01

    Supply Side and Equipment Grounding Conductors in HV Substation

    I'm not sure what secondary HV voltage we are looking at; however, my take is that there should be an NER installed, and I would install earthing conductors into the HV substation earthing copper bar.
  3. Padlock01

    Incoming device as Disconnector Switch / Isolator

    The switch disconnector on the MCC will not discriminate between the outgoing MCCBs if the outgoing MCCB's protection is not set properly then you will trip the MCCB / ACB feeder on the Main LV switchboard.
  4. Padlock01

    Fibre Cable

    Hi Guys, Please assist me in confirming whether one can share 12 RIO panels with 15 Remote outlets for cameras sharing a 24core Multimode fibre cable.
  5. Padlock01

    Load Demand Calculation MCC Panel

    Hi anitharts (Electrical)(OP) Maybe the attached software will be helpfulhttps://files.engineering.com/getfile.aspx?folder=20e59d58-26b4-4657-a551-2d7be82e447f&file=Master_Load_List_.xlsx
  6. Padlock01

    Transmission Line Clearance

    Hi timm33333 I have attached a copy of our Utility "ESKOM" OHL clearances in RSA perhaps helpful?https://files.engineering.com/getfile.aspx?folder=863eab39-bf95-4eeb-a043-e3246b631ede&file=OHL_Clearances.docx
  7. Padlock01

    About three-phase unbalance standard

    Hi YKC Perhaps the attached file may help you.https://files.engineering.com/getfile.aspx?folder=f49da418-a5ea-46cf-8943-7909d2a516a7&file=SANS_VD_Calculation.xlsx
  8. Padlock01

    Single core cables and a mild steel gland plate.

    Hi SilverfoxUK Cutting slots in a mild steel gland plate between single-core cables worked very well in the old days however, these days we use stainless steel or aluminium plates to prevent Eddy currents from circulating.
  9. Padlock01

    Voltage drop for Motor Feeder

    Hi All, SANS spec states voltage drop should be based on 5% of the cable voltage from the TX source to the motor terminals. A motor running voltage drop of 2.5% VD. Starting VD of the motor between 15%-20%VD.
  10. Padlock01

    690VAC distribution in USA

    Hi All, In South Africa, we use the following voltages for LV motors 50Hz 415V 525V 690V 1000V voltages above 1000V are classed as MV ie. 2,2kV 3,3kV 11kV 22kV 33kV beyond their HV then EHV.
  11. Padlock01

    YNd11 (earth fault at delta side)

    I would rather make the transformer Dyn11 and install an 11kV NER which solve the earthing issue.
  12. Padlock01

    5 conductors per phase parallel run

    Perhaps one should follow the attached arrangement.https://files.engineering.com/getfile.aspx?folder=1656647a-cb7c-4aea-b1d3-2e948d570dcd&file=Trevoil_detail.docx
  13. Padlock01

    E-Stop requirement

    Histor, (Electrical)(OP) I suggest you ignore the process engineers they won't be the ones who are locked up if there is a fatality. As an electrical engineer / reasonable person I would Install an E-Stop adjacent to the motors. In RSA its Mandatory.
  14. Padlock01

    VFD: In MCC Or Separate Cabinet?

    I would say 110kW (147HP) VSD is the limit for mounting in an MCC.
  15. Padlock01

    Looking for a Cable Sizing software

    Hi Simone22 Attached is an EXCEL program we use in RSA Metric cables.https://files.engineering.com/getfile.aspx?folder=cc7384e0-37e9-4266-830d-4bd6fcbf774c&file=Master_Motor_Cable_Calculation.xlsx
  16. Padlock01

    Under Voltage release / relay for the final distribution board

    My take is that yes the final DB to the consumer should have UV and OV protection, A recent case at our complex where robbers stole the 400V neutral cable which blow up most of the residents appliances.
  17. Padlock01

    Electrical schematics software

    Hi kapmnit123 I use ProgeCAD its a once off payment no annual licence fee should you purchase it I can send you a CAD drawing with all electrical symbols together with a typical schematic diagram. My email paddykeys@gmail.com
  18. Padlock01

    Combined MV/LV Switchgear Room

    Hi Instrument1352 First I would dump the oil switchgear and Install SF6 MV switchgear depending on voltage level. issue a Single line diagram (SLD) to would be tenderers for switchgear they will advise on Type of protection relays. As far as the separation of MV / LV switchgear I would advise...
  19. Padlock01

    Genetator breaker

    Hi Mlmlzx I have used the ABB T-Max MCCB's for 3 550V generators and the Sinc panel outgoing SACE E Max 2 MCCB Had no problems I would recommend ABB.
  20. Padlock01

    Transformer oil testing

    SAO7 Hermetically Sealed Oil Filled Transformer has an oil drain tap to take oil samples annually as per Mines statutory requirements (RSA)

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