NEC rules for sizing cables and gensets

[sinnadurai sripadmanaban]

Please give extracts from NEC the guidelines for sizing cables and gensets for
a)different types of loads like intermittant(elevators),periodical,short-time etc
and for
b)different types of starting methods like across the line,wye-delta,auto transformer,vsd,vfd,shunt capacitor etc

 

[nakulak]

article 430

 

[sinnadurai sripadmanaban]

Art 430

Art 430

I donot have a copy of Art 430.Could you briefly describe it?

 

[jumper]

If you go here:

,http://www.nfpa.org/itemDetail.asp?categoryID=84&itemID=17989&URL=Membership/Join NFPA

You can sign up for free and access all the NFPA codes, NEC is NFPA 70.

 

[iceworm]

A majority of the issues you are asking about are not regulatory, rather they are design issues. The NEC does not do very well at specifying design issues.

A good initial reference source is IEEE 446, Emergency and Standby Power Systems for Industrial and Commercial Applications (Orange Book).

ice

 

[tom baker]

Please give extracts from NEC the guidelines for sizing cables and gensets for
a)different types of loads like intermittant(elevators),periodical,short-time etc
and for
b)different types of starting methods like across the line,wye-delta,auto transformer,vsd,vfd,shunt capacitor etc

Thats far beyond the scope of a typical question we see. The NEC is prescriptive, IE follow the rules in Art 310 on condutor sizing. Your are asking performance type questions, thats not practible to answer here.

 

[sinnadurai sripadmanaban]

NFPA document

NFPA document

Can someone give the document number for the "maximum allowable voltage and frequency drop at generator and motor terminals" during starting a heavy or motor load

 

[don_resqcapt19]

Can someone give the document number for the "maximum allowable voltage and frequency drop at generator and motor terminals" during starting a heavy or motor load

In general that is a design issue and not addressed by the NFPA codes.

 

[iceworm]

Can someone give the document number for the "maximum allowable voltage and frequency drop at generator and motor terminals" during starting a heavy or motor load

NEMA MG-1 is a good reference.

ice

 

[sinnadurai sripadmanaban]

Can someone provide links for NEMA MG-1 and Art 430

 

[iceworm]

Can someone provide links for NEMA MG-1 and Art 430

Nema mg-1 is here: http://www.nema.org/stds/mg1.cfm

The link to NEC article 430 is in post 4

ice

 

[tom baker]

Can someone provide links for NEMA MG-1 and Art 430

Google NEMA MG-1. Art 430 is part of the NEC, you can buy a copy of the NEC or it can be viewed on line.