The State of Michigan has adopted the 2005 Michigan Electrical Code and it becomes effective on November 23, 2007. One area which has an impact is
Article 210.12 which relates to Arc-Fault Circuit Interrupters.
Lighting and Appliance Branch Circuits in Dwelling Units. When the service equipment at a dwelling is replaced, a listed arc-fault
circuit interrupter, branch/feeder type, or a listed arc-fault circuit interrupter, outlet branch circuit type, shall protect each branch
circuit that existed prior to the replacement that serves 125-volt, single-phase, 15- and 20-ampere outlets for lighting and appliances. The
arc-fault circuit interrupter, outlet branch circuit type, shall be installed at the outlet closest to, and within 3.0 m (10 ft) of the
overcurrent device as measured along the branch circuit conductors.

Siemens Combination Type AFCI trip indicators provide a valuable analysis tool to help electricians pinpoint the type of trip. These indicators
are in the form of LEDs that appear near the handle of the breaker. The LED indicators will appear for 5 seconds each time the AFCI is turned “ON”
up to 30 days after the last trip. One LED will be illuminated if the last trip was a result of an arcing fault to ground. No indicator will be
displayed if the AFCI trips as a result of an overcurrent condition. The last known trip indicator can also be manually cleared from memory to
assist with verifying resolution of the problem.