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Guys, I'm wondering about the meanings of the numbering system for IEC Electric Motors. What does 160L or 225S or 200LG mean? Is there anyone who can help me with this? If you can pass me a book or a page that explains these things, it would be a big help. Thanks!

HEY GUYS! HOPE YOU'RE ALL DOING FINE...JUST WANT TO CLEAR OUT ONE THING THOUGH. IF I BUY A 380V/50Hz MOTOR, CAN IT RUN ON A 415V/50Hz MAIN SUPPLY CONNECTED IN AN OPEN Y-DELTA CKT? THANKS FOR THE HELP!

hello guys, can anyone give me an idea when i should use a y-delta connection or an across the line connection for an electric motor circuit? just want to know how much Hp should I start connecting with a y-delta. The line is 3PH, 50Hz. thanks guys!

Actually the system is for a control panel of a Diesel Engine driven fire pump. the starting system for the diesel engine would be either 12VDC or 24VDC depending on the starter requirement. but the control panel in itself has an AC supply voltage to it. But i don't think that the positive and...

hello everyone, Can anyone possibly tell me what the difference is between a POSITIVE GROUND AND A NEGATIVE GROUND (EARTHING) in the usage for control panels? It's not alarm control panels...it's for electrical control panels for fire pumps. we are using two electrical motors possibly 220V/50Hz...

good news today... they have given me the 'go' to start the approval of the fire pump sets...THANKS GUYS FOR THE ENLIGHTENING DISCUSSION...ESPECIALLY SIDEWINDER...now all I have to do is find a catalogue of electric motors in the market for 380V/3Ph/50Hz TEFC, in class F insulation with UL/FM...

The local fire department here is asking for a TEFC, class F insulation UL/FM listed electric motor for the FIRE PUMP SET that we are trying to get approved here. We dont have the actual pumps yet, we are only relying on the specs given by the suppliers in their brochures. But sadly all I have...

This IS another problem that I am facing because I have been searching for TEFC motors and they are normally coming in the speed of 3600 rpm which is the speed in a 60Hz frequency.But there is a note: 60/50 Hz rated with no derate on HP; 230/460 volt 60 Hz ratings operate on 190/380 volt 50...

thanks very much for the info. very much helpful and kinda confirms my theory. I'm actually in the process of approving a set of pumps for the local fire department here and I have to be quite prepared for his questioning. :) Here in Kuwait that would be 50Hz frequency. That means sych speed...

I am in a bind here guys...I cant seem to explain what a synchronous speed is and its use for electric motor drive selection for our fire pump. the Design Data point is: power required by pump: 46.3Hp Eff of pump: 70% operating speed: 2900 rpm The motor size generated by the system was...

Hello, I am a Fire Engineer and working for the past 3 years in the field. Hope to broaden my knowledge in the fire alarm and electrical systems both in Fire Protection field.