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Is there any good link describing a large compressor motors ( 5000-6000 HP) in my case applied in petrochemical industry. Also I would like to now who is manufacturer of these motors.

The same question - Is anybody making relay with separated contacts, ready to accept different voltages on auxiliary contacts. (like 120VDC and 240AC )

I REPEAT - word relay fargotten first time Design prepared by another company provides relay with a coil 24 VDC. plus two auxiliary contacts 120 VDC and two auxiliary contacts 240 VAC . Something is wrong there. Generally how to solve that problem ? ( according NEC)

Design prepared by another company provides with a coil 24V DC. plus two auxiliary contacts 120 VDC and two auxiliary contacts 240 VAC . Something is wrong there. Generally how to solve that problem ? ( according NEC)

I need two motor breakers (thermal magnetic) for 100HP, 480V and 300HP, 480V motors. No extra load, CB's are to protect motor and wire. The problem is un-standardized FLC's, little lower than FLC's specified by NEC. Can I use a smaller breakers - or can I use 200A and 600A breakers in my case ...

For the motors 100HP and 300HP, 48o Volts size of the breakers has been determined. Now we have a new information including FLC currents ( lower than conventional) 100HP, 48o Volts with FLC=110A 300HP, 48o Volts with FLC=335A Can we use 200A and 600A breakers ?

Canadian Electrical Code 2006 is introducing a couple new changes. Ones of these are Secondary Seals. Rule 18-002 ...Secondary Seals are designed to prevent flammable process fluids entering the electrical wiring system upon failure of a primary seal. These devices prevent passage of fluids at...

Why won't the engr's accept derating? Good Question. Existing part of the plant has area with that temperature where derating has not been provided. Also owner of the building is not accepting derating. Generally I agrre with you that derating must be provided.

Is it necessary to provide Cable Ampacity Derating factors for the ambient temperature of 105 deg.F or 40 deg.C inside Chemical Plant Building. ( conductor 90degC) I am in Canada where Canadian Electrical Code provides factors 0.87-0.90 but other engineers are not accepting that idea. Thanks.

For large Capacitor Banks, like 300MVA, 69kV a special breaker must be used - SF-6, vacuum, oil C.B. etc. What is going on for the capacitor bank 300kVA, connected to MCC 600Volts ? What type of breaker must be used ?

Most capacitors are designed to operate at 135% of their kvar ratings. I am finding for that situation 1.25 factor must be provided. Also, some manufacturers suggested cable sizes for their capacitor banks. I re-calculated their cables and I found that 1.25 factor is included, othewise cables...

For the calculation of the 200kVA Capacitor Bank Cable Size I started by : Amp = 1.35 x 200 kVA / 1.73 x 600 Volts After that, that Amp I multiplied by 1.25 Some people working with me is is trying to say that we don't need a another multiplication (by 1.25), what I can not accept. Please...

I need a article describing l.v. circuit breakers and contactors provided for protection of capacitor banks - in my case 300KVAR 600V THANKS

Because of explosions, Grain Elevator area is very dangerous area. In my case I have Industrial Plant with corn grain as raw material, where bolt conveyors are used for transportation of that raw material. That is open area, but provided to be classified as Division 1 . How far to go with...

I agree with you- Quebec is in Canada, but I was thinking that Electrical Code there is based also on IEC - european standard, but that is nor true ???

We have to prepare for a small contract in Quebec - a small chemical plant. We are preparing to buy CEC-Canadian Electrical Code with an amendment for Quebec. Is it enough for the electrical works in that province...? I am discussing about differences between Canadian and "Quebec Code" ? Thanks.

I need a links about - Ethanol Plant Hazardous Area Classification. I have to start work on Instrumentation and Controls as Electrical Engineer, but Hazardous Area Classification is also coming on my desk one day. Thanks.

Industrial Power System provides five transformers 13.8 / 0.6 kVolts - 2000kVA - 3pcs, 225kVA - 1pce, 150kVA - 1pce, (a) 2000 kVA transformer has 1926 Amps on secondary side, but 3000 A bus is connected there with 3000 A main breaker. (b) also, 150 kVA transformer has 144 Amps on secondary...

How full Cable Tray is full ? The fundamental rules are mechanical forces defining Cable Tray Support and percentage of the cable fill (40-50% by NEC). Here in Canada is very important to reduce Cable Ampacity depending from the space between installed cables. ( CEC and OSEC) That is my...

Ask Manufacturer - That is the way.