Ill. Admin. Code tit. 83, § 501.540
Good Engineering Practice
AUTHORITY: Implementing and authorized by Sections 8-301, 8-302, 8-501, 9-201, 10-101, 10-107, 19-110(e)(3) and 19-115(b)(1), (b)(4) and (b)(5) of the Public Utilities Act [220 ILCS 5/8-301, 8-302, 8-501, 9-201, 10-101, 10-107, 19-110(e)(3) and 19-115(b)(1), (b)(4) and (b)(5)].ILLINOIS COMMERCE COMMISSION
A utility shall use accepted good engineering practice to plan, design, construct, operate and maintain its natural gas delivery facilities to ensure adequate, efficient, reliable, safe and least-cost service to customers.