Michigan Compiled Laws, Chapter 484. Telephone, Telegraph and Radio § 484.2305c

(a) A facilities-based provider shall equip each central office, remote switch, remote line unit, and interexchange toll switching office or access tandem with a minimum of 3 hours of peak load battery reserve, if permanent auxiliary power is installed, and 5 hours of battery reserve, if permanent emergency power is not installed, or 8 hours of battery reserve if the central office is in a remote location. A facilities-based provider shall have available a mobile power unit to be delivered and connected to central offices, remote switches, and remote line units within 8 hours.

(b) An E 9-1-1 service supplier shall provide 24-hour, 7-day-a-week database access to permit information to be acquired or corrected.

(c) A provider, E 9-1-1 service supplier, public safety answering point, or any entity providing or maintaining E 9-1-1 database information shall correct each error in the 9-1-1 system or database within 1 business day.