On Thu, 10 Nov 2005 09:44:54 -0500, "Percival P. Cassidy"
wrote:

A year or more ago I replaced a regular breaker by an AFCI breaker in a
bedroom circuit in our 30-yr-old house, and it's never tripped once.

This is a Cutler-Hammer CH panel and breaker. Perhaps Siemens hasn't yet
figured out how to build them right.


From the OP's description, the breakers are tripping because
they *ARE* detecting an arc fault, only on the supply side
instead of the load side.