Recent content by Michael2009

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...

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...

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..

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?

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...

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...

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...

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?

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

I dont have motor plate photo..

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

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...

Thank you all for your help.

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...

Hi Jraef, thanks and appreciate your helpful reply..