This is a copy of an Eaton document which should help in the understanding of the application:
http://www.eaton.com/ecm/groups/public/@pub/@eaton/@ee/documents/content/ap01200008e.pdf
In addition, this is an excellent in MC&M writen by Jim Pauley Manager, Industry Standards, and Sandi Young is Circuit Breaker Product Specialist with Square D Co., Lexington, Ky. and Cedar Rapids, Iowa respectively:
http://ecmweb.com/mag/electric_sizing_circuit_breaker/
Insidently, there are no 90degC lugs available for MCCBs.
Siemens says this:
Q: Does Siemens have breaker lugs rated for use with 90 Deg C wire?
A: The short answer is no - nor does any other breaker manufacturer. However, 90 Deg C insulated wire CAN be used IF it is sized per the 75 Deg ampacity column in the NEC tables. In fact, with most of Siemens 100% rated circuit breakers, 90 Deg. Cable is required, but it must be sized per the 75 Deg ampacity.
I trust that this addresses some of the myths about this unusual device.
http://www.eaton.com/ecm/groups/public/@pub/@eaton/@ee/documents/content/ap01200008e.pdf
In addition, this is an excellent in MC&M writen by Jim Pauley Manager, Industry Standards, and Sandi Young is Circuit Breaker Product Specialist with Square D Co., Lexington, Ky. and Cedar Rapids, Iowa respectively:
http://ecmweb.com/mag/electric_sizing_circuit_breaker/
Insidently, there are no 90degC lugs available for MCCBs.
Siemens says this:
Q: Does Siemens have breaker lugs rated for use with 90 Deg C wire?
A: The short answer is no - nor does any other breaker manufacturer. However, 90 Deg C insulated wire CAN be used IF it is sized per the 75 Deg ampacity column in the NEC tables. In fact, with most of Siemens 100% rated circuit breakers, 90 Deg. Cable is required, but it must be sized per the 75 Deg ampacity.
I trust that this addresses some of the myths about this unusual device.