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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.

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

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

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

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.

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.

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.

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

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

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.

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

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

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.

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

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...

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.

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

Hi Cranky I have attached list of ACSR conductor info we use South Africa.https://files.engineering.com/getfile.aspx?folder=1b144675-b4e6-43b7-9e91-617d3fa2c482&file=OHL_ACSR_Conductors.pdf

Hi Saurav West, 1 x 30MVA = @ 33kV = 525Amp x 5 = 2625 Amps Goat ACSR conductor = 730amp Would it not be feasible to step-up from sub 33 / 88kV OHL then stepdown at each 30MVA

rand1234 As per your illustration you have correctly lockedout the power to the motor at the source (MCC).