Grady Box™, HomeRunner™ and MudRunner™ products have been certified for use in the United States and Canada by the Canadian Standards Association (CSA) under CSA Standard C22.2 No. 18.1-04 and UL Standard 514A (Tenth Edition) for Metallic Outlet Boxes to CSA Standard C22.2 No.30 and UL Standard 50 for Junction, Cut-out and Pull Boxes, and as CSA Standard C22.2 No. 18.3-04 and UL Standard 514B (Fifth Edition) for Conduit, Tubing and Cable Fittings.  The ‘C’ and ‘US’ indicators adjacent to the CSA Mark signify that Grady Box has been evaluated to applicable CSA and ANSI/UL Standards for use in Canada and the U.S., respectively.  The ‘US’ indicator includes products eligible to bear the ‘NRTL’ indicator.  NRTL, i.e. National Recognized Testing Laboratory, is a designation granted by the U.S. Occupational Safety and Health Administration (OSHA) to laboratories which have been recognized to perform certification to U.S. Standards.