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  1. martinrelayer

    Corrosion on cable trays.

    hello, yes some of them which are same type of bolts are not rusted..
  2. martinrelayer

    Corrosion on cable trays.

    Hi all, thanks you very much for your comments. All bolts are hot dip galvanized. You can see some of them are not rusted so I suppose is the fixing of the bolts and nuts that breaks the coating? Or should I thing it is more of a problem on the galvanization process? Would it be that after...
  3. martinrelayer

    Corrosion on cable trays.

    Hello, In a wastewater plant, there´s installed HDG cable trays with what seemed good HDG bolts (same supplier) No some years passed and only see the bolts rusted. What could cause this in particular and what can be done? Replacing bolts from same material Hot dip galvanized seem to have the...
  4. martinrelayer

    Aluminium cable lugs

    Hello I have the cable lugs Al-Cu in an installation I would like to know if the attached tool for crimping is okay or if it should be hexagonal. Any insight would be much appreciated...
  5. martinrelayer

    Low voltage switchgear colors

    yea agree that factory might charge a lot on cleaning the powder equipment to change the paint color. Thanks
  6. martinrelayer

    Low voltage switchgear colors

    Hi! We have 400V and 690V MCCs painted RAL7035, several inside an electrical room. New panel is coming for UPS distribution feeds (two or three columns of fuses and MCBs inside) to be installed in the same electrical room, and I wonder if those shall be specified different color. Switchboard...
  7. martinrelayer

    Sizing conductor rail of cranes

    Yeah I was googling but couldn't get any information on busbar systems to somehow check if there is a money issue only or if it's is technical process wants to have both cranes reach all the lenght
  8. martinrelayer

    Sizing conductor rail of cranes

    Hi all, new 2 overhead cranes of 500 meters travel on the same busbar rail needs 900A feeding. the plan is to feed from 3 different points due to voltage drop. Voltage is 400V. we requested single feeding but they state it's technically impossible. what do you think on this? it is like that...
  9. martinrelayer

    instrument transmitter circuit breaker 1 pole or 2 pole???

    thanks!!
  10. martinrelayer

    insulation monitor device for small cables

    thank you very much!!!!!!
  11. martinrelayer

    insulation monitor device for small cables

    one more thing is that those 230Vac are Live and Neutral. i've seen insulation monitors for ungrounded systems but this is not the case..
  12. martinrelayer

    insulation monitor device for small cables

    Hi all, we are thinking if there's some insulation monitor for cables. They carry 230Vac, that are for a contact of safety switch in field. The cable construction is with armour. thanks in advance!!!!
  13. martinrelayer

    instrument transmitter circuit breaker 1 pole or 2 pole???

    Hi all, we are planning to install some ph, magnetic flowmeters and other instruments with powered transmitters, all of them with 230Vac supply for transmitter, this mains 230Vac coming from dedicated UPS switchboard. All of the transmitters have own passive 4-20mA output connected to DCS. The...
  14. martinrelayer

    DNP3 ethernet communication problem MV relays

    they are 10 meters long
  15. martinrelayer

    DNP3 ethernet communication problem MV relays

    hello, we have here small distribution switchgear 33kV, each breaker has it's own relay (Schneider VAMP Relay 255) connected to SCADA by DNP3 over ethernet (10MBps) all vamps goes to standard Cisco switch, ethernet cable is category 6 UTP, no shielding, vamps earth connection checked and so...
  16. martinrelayer

    AC Drive tripping motor protection switch heat problem

    looks it arrived here the stuff! acs800 - 120A - 690V with dU/dT filter (not sine) 15kW motors 690V x 5 application: FAN 5 motors in parallel, each with it's corresponding mot protection switch and contactor. well I was taking a look at the application, and suggested to remove output motor...
  17. martinrelayer

    AC Drive tripping motor protection switch heat problem

    yes motor prot switch should disable drive, you're right. thanks to all kind regads, martin
  18. martinrelayer

    AC Drive tripping motor protection switch heat problem

    I wonder if measuring thermal protection CT's must be iron core or hall effect. mainly thinking on this higher power application. regs, martin.
  19. martinrelayer

    AC Drive tripping motor protection switch heat problem

    LionelHutz good advice!!! This I don't regard as big problem BUT they want to put 5 (five!!!) 15kW motors in parallel... so I was around this issue mainly because they want to do the same application but larger power in a couple of months!! I didn't know of this problem but electricians have...
  20. martinrelayer

    AC Drive tripping motor protection switch heat problem

    i've found something https://cache.industry.siemens.com/dl/files/798/24232798/att_116866/v1/switching_devices_in_environment_of_frequency_converters.pdf

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