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  1. Michael2009

    GRE Piping Conductivity Testing at Site

    Hi, I try to measure a GRE pipe with my multi meter. I am expected to get some mega ohm reading. But i getting totally open connection. (insulated) that is require for GRE pipe to be conductive in hazardous zone. Vendor also claim their pipe is conductive type. But dont get the physical ohm...
  2. Michael2009

    3 phase 440V AC 60Hz (IT) to 2 phase 220V AC distribution design

    Hi Guys, I have 3 phase 440V AC 60 Hz as incoming. is LV IT system 3 wiere without neutral distribution. How can i get 2 phase distribution as 220V AC (without N distribution)? Can i just tap L1 and L2? Some people tell me yes Some say i need Isolation transformer ... thanks for clearing my...
  3. Michael2009

    IT System Insulation monitoring or Earth Leakage Device

    Hi friend, 1. In 3 phase IT system Insulation monitoring device and earth leakage device service the same protection? 2. If my 3 phase IT System upstream come with IMD. My down stream still require a ELR? THanks for helping..
  4. Michael2009

    2 phase power supply Meaning?

    I not in japan.. just a project spec. I think i will rephrase a bit my question. Client supply two phase power L1 and L2 (2-wire) to my instrument. Can i connect L1 to L and L2 to N in my instrument?
  5. Michael2009

    2 phase power supply Meaning?

    Hi Friend, Client power system is IT system for 220V AC utilities supply they put 2 phase supply in 2 wire L - L. So my instrument, lighting, everything is single phase L N E connection. So can i direct wire supply L - L to L - N terminal? or i need a transformer for between the supply and...
  6. Michael2009

    Motor Rated power vs require power

    thanks panter , scottyUK, Lionelhutz I understand the whole picture now. Pump BHP is 344 kW and API requirement 110% of duty. So is 380kW. Then motor standard size is 450kW and 420kW is derated value on 45 degC ambient. Now i got 2 final question.. 1. Normally in motor catalogue, we can see...
  7. Michael2009

    Motor Rated power vs require power

    I actually confuse .. my supplier tell me, they normally stamp motor plate base on design rated of motor (Standard manufacture motor rated) instead of motor output) instead of output power rated. In this case, it will be 420 kW. but in their pump datasheet showing BHP = 344 kW. For me, 380 kW is...
  8. Michael2009

    Motor Rated power vs require power

    that mean 380kW is require mechanical power (motor output). So motor input is 420kW, load consideration is 420kW. then my starting current shall be base on 420kW not 380kW... my understanding correct?
  9. Michael2009

    Motor Rated power vs require power

    that mean i have to consider 420kW in load list? and the motor nameplate should stamp 420kW ?
  10. Michael2009

    Motor Rated power vs require power

    I dont have motor plate photo..
  11. Michael2009

    Motor Rated power vs require power

    ambient temperature go up, continuous torque will reduce and rating will go up?
  12. Michael2009

    Motor Rated power vs require power

    Hi friend, I am not electrical person... I am confusing about some data in motor datasheet. We have a pump which have BHP = 344 kW. And Siemens induction motor will drive by 4160V 60Hz. In vendor datasheet it show Nameplate power "min 380 @ 45 degC kW. and in other line of datasheet it show...
  13. Michael2009

    Electrical Distribution board design and connection philosophy

    Thank you all for your help.
  14. Michael2009

    LV 480V Motor Earth theminal Inside terminal box

    Hi Guys, I encounter some of the plant/offshore engineering design for 3phase LV 480V motor earth terminal inside enclosure (terminal box) is connect directly to local ground (Structure). Instead to go back to main switchboard or MCC. Frame earth also to local earth (Structure). But when I...
  15. Michael2009

    Confusing on sizing MCB and Cable

    Hi Jraef, thanks and appreciate your helpful reply..
  16. Michael2009

    Confusing on sizing MCB and Cable

    Hi Jraef, The Motor starter have 80A TP Contactor and OLR 63-80A. We take IEC standard as guideline.. So if the motor start come with OLR. 1.25 times for FLA will be the MCB rating? thanks.
  17. Michael2009

    Confusing on sizing MCB and Cable

    Hi Guys, I am confuse while checking my contractor drawing. Motor FLA = 47A MCB 3P = 80A (Installed outdoor at 55degC inside enclosure, derating to 72A) Power rating = 480V 3 phase 60Hz Cable Run around 50 meter Cable selected 35 mm2 (Current capacity in catalog 136 A) While I doing the...
  18. Michael2009

    High Pressure Pilot operate pressure reduce valve.

    Hi Guys, I looking for HP Pilot operate pressure reduce valve. o Operating Pressure: 0-5000 psi o Operated Flow rate: 20.9 m3/hr. Unfortunately, all supplier return with their PRV only can work for 500psi... Did you guys encounter any HP PRV? Myself actually never bought PRV working in so...
  19. Michael2009

    Any Internation or rule of thumb to decide the motor shall run with LV or MV.

    Hi Sir, Did we have any international guideline or rule of thumb to determine the motor shall power by LV or MV. I am struggle to make decision. I have a project motor size is 200HP. And LV voltage is 380V 3phase 50Hz. I am thinking to go for MV system 6.6kV... Any standard guide telling how...
  20. Michael2009

    Electrical Distribution board design and connection philosophy

    Hi 1Capybara, I was refer to IEC standard. Will it have any different? The application are for industry plant My DB incoming have five terminal , L1, L2, L3, N and PE. My client provde 4-wire 3phase. I will connection wire L1 to L1 terminal, L2 to L2, L3 to L3 and N to N. Then my Incoming PE...

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