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Is this the insulation class gordon or the transformer class that these temps refer to?

Does anyone know what temp is related to class H i have vendor literature that refers to 220 degrees C but when i look up insulation classes at other sites it refer to class H as 180 degree C thanx GDL

All, A few weeks ago I posted a question about this subject which seemed to cause confusion over the SI units being utilised. Since my question I have clarified it and am posting for all's info. Inertia Constant 'H' can be defined as the ratio of stored energy at a rated speed to the rated...

All, Can anyone explain the relationship between J = GD(Squared)/H and kW sec/kVA. Regards G

Coolfish, If you lookup CAN/CSA -E947-1 Lowvoltage switchgear and control gear part 1 general rules on the CSA website you will see that they have adopted this standard from IEC 947 1996. The question is are they going to adopt further IEC standards and how does this standard interact with CSA...

Gordon,Not sure but it is my intention to have a word with one of the guyz at CSA - i have been given a number to contact a guy. if you go to the CSA.ca you can select us and international in products and services and type in e947-1 in the search (or E79 hazourdous)to see the titles but no note...

Does anyone know who distributes cabsys the cable routing software - or can suggest another proven package? G

All, A relatively new CSA standard (1999) has been developed from the IEC standards for LV switchgear and control gear - part 1 general rules! before i purchase the standard i would like to know how this interacts with CSA 22.2 No. 31 for switchgear assemblies? and what changes have been made...

All, I am after a bit of advice utlising 'intelligent' MMC's - basically does anyone have any experience of such devices and what the manufacturers mean by 'intelligent'? am i correct in thinking that these devices can be bought as an integral part of the MCC enclosure and they have various...

G, i was supposed to add this to the back end of the other forum. G

Gordon, The 3/2 start requirements comes from the API standards specific for the oil and gas industry. If you are interested i will find out the actual references. these standards outline the requirement for the compressors and and pumps being driven - and probably based on the old saying...

Thanx people - much appreciated - i'm sure i'll have some more puzzles for you at some point! good site! Gavin

Peterb - sorry LRC - locked rotor current - therefore the starting current is 3.2 x the nominal current. We are looking for 3 starts cold and 2 starts hot. i am looking at some literature originated by Shell to be utilised when selecting motors. In this document it states: the allowable run...

Maybe look at some of the standards for electrical systems offshore and ships the IEE have shipping recomendations and standards that must be adhered to. i can't remember the exact details of the top of my head.

Thanks for that peterb - we are specifying that the maximum volt drop at the motor terminal can never be greater than 15% of the terminal voltage, hence trying to increase the 80% value to 85%. Remember this is a new installation and the cable sizing we have carried out is preliminary and we...

Maybe you should forget about your driven load when you first look at this problem - and evaluate the efficiency/complexity/charachteristics of the existing control network and how it was matched to the driven load - once this is known you can then look at improving the control network. Try...

People, We am currently looking at purchasing some large induction motors for a client to drive compressor and pump units (3MW - 10.5MW on offshore application). The original spec is outlining that the motors should be able to start @ 80% terminal voltage @ 3.2 LRC as a worse case scenario...