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  1. cmelguet

    grounding and bonding of conveyors.

    Hi Zanoter, Thanks for your answer. The conveyor structure is grounded using a proper grounding electrode, but only at the start and at the end of the conveyor. See drawing attached. Isnt this good enought? Regards...
  2. cmelguet

    grounding and bonding of conveyors.

    Hi Zanoter4, Thanks for your answer. First i want to clarify some points: - The cable ladder is galvanize steel cable ladder. - We are running a naked copper 2/0 AWG conductor along the cable ladder to use as a grounding conductor. - We are not running any buried cable along the conveyor. The...
  3. cmelguet

    grounding and bonding of conveyors.

    Hi Waross, Thanks for your answer, i think i was not understand correctly. What I wanted to do is to eliminate the buried conductor and only leave the tray bonding cable. The idea is to use the tray bonding cable to bond the structure. Regards.
  4. cmelguet

    grounding and bonding of conveyors.

    I attahced the file again. Its seems did not work the first time. Regards.http://files.engineering.com/getfile.aspx?folder=452491f8-07f7-4b74-8969-4afc423ebfa7&file=SCAN_SGSCM001.pdf
  5. cmelguet

    grounding and bonding of conveyors.

    Hi, I have a grounding question again. Please refer to the attached drawing. At the project we have an overland conveyor of 1km long. At the start of the conveyor we have a 33/4.16 kV 5 MVA transformer substation with its grounding grid designed according to IEEE 80. At the end of the conveyor...
  6. cmelguet

    FRP cable trays

    Thanks 7anoter4, The 33 kV system is resistance grounded (600 A). Another idea, the 33 kV cables installed in the cable ladder have a screen. Can i use the screen as a grounding conductor?. In this way i dont need to run a grounding cable along the FRP ladder. Regards?
  7. cmelguet

    FRP cable trays

    Hi, I am involve in a project where we are running several 3 phase circuits of 33 kV using single phase conductors arranged in a trefoil formation. The cables are installed on a FRP cable ladder which is no good as a grounding conductor. The circuits lengths is around 1000 m, and all of the...
  8. cmelguet

    grounding medium voltage motors

    Hi Waross I understand the purpose of the mesh platform next to the motor, but why you dont recommend connecting the mesh to the ground grid and from the mesh to the motor? regards
  9. cmelguet

    33 kv cable joints

    Hi, Does anyone know if the NEC had any restrictions on using cable joints, tape, or preassembled ones.This is for 33 kV, 500 MCM cable trifoil formation runned on above ground cable ladder and also underground cable duct.The length of the circuit is 1800 m. I was told that it is not allow and...
  10. cmelguet

    grounding medium voltage motors

    Hi dpc, thanks for the feedback. We are running a grounding conductor next to the phase conductors. I was whttp://www.eng-tips.com/orry about the bonding of the motor to the groundgrid. regards
  11. cmelguet

    grounding medium voltage motors

    Hi all, I have two underflow pumps (552 kW each, 4.16 kV) for the thickeners in a mining project. For this size of motors I normally use a two 2/0 AWG bare copper cable to ground the motor directly to the earthing grid. In this case we dont have a grouding grid under the motors because of...
  12. cmelguet

    Grounding and bonding NEC 250 questions.

    Thanks for all your answers. it is clear to me now, i hope i can make the consultant company understand. Regards
  13. cmelguet

    Grounding and bonding NEC 250 questions.

    Hi Kiribanda, From my point of view, if there is a ground fault at the motor, the current will flow through the motor housing to the ground grid and then through the ground grid to the neutral point of the transformer. Isnt an effective ground fault path the 4/0 AWG conductor used as ground...
  14. cmelguet

    Grounding and bonding NEC 250 questions.

    i think now is really attached, sorry for the mess. Regards,http://files.engineering.com/getfile.aspx?folder=af0732c2-1e73-4e24-9cf8-c779e378815e&file=img-110153547-0001.pdf
  15. cmelguet

    Grounding and bonding NEC 250 questions.

    Sorry forgot to attached the drawing.
  16. cmelguet

    Grounding and bonding NEC 250 questions.

    Hi, I am from Chile where we have our own standard for low voltage installations, but since they are not updated since 2003,we normally also follow the NEC as a good practice guide. Article 250 of the NEC states: 250.24(C) For 1000 V or less AC Systems, neutral conductor shall be routed with...
  17. cmelguet

    IECEX certified equipment in NEC 505 clasified areas

    Thanks Vincent, but how the manufacture of the equipment get the AEx marking?. It needs to certified the equipment under IECEX standards?.
  18. cmelguet

    IECEX certified equipment in NEC 505 clasified areas

    Hi, can anyone explain if IECEx certified equipment can be used in hazardous areas clasified under NEC 2011 code 505. From the code it seems that the marking on the equipment needs to be AEx instead of IECEx. This mean the manufacture of the equipment needs to certified its equipment on the US...
  19. cmelguet

    cable ampacity table NEC

    thanks DPC. Regards
  20. cmelguet

    cable ampacity table NEC

    Hi dpc, With trifoil i mean triangular formation, as showed on the attached file. Please clarify, I cant installed the cables as per showed in the first drawing in the attached file using (c). Regards, and thanks again. Cmed...

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