Enclosures shall normally be supplied in the five sizes detailed below. 3050mm width, 2225mm depth, 2300mm height, (clear inside dimensions), - Unit Substation Enclosure, -. Metal meter cabinets shall be of equivalent size and design as given for the GRP cabinets in British Standard 8567-2012. Physical sizes of the metal and GRP meter cabinets used within Western Power Distribution shall be as detailed in section 6. Accepts 86mmX86mm size outlets, INTERNATIONAL CONFIGURATIONS, INC. (47 mm DEEP), "EARTH" TERMINAL, ADJUSTABLE MOUNTING LUG (LEVELS DEVICE & WALL PLATE), 20mm and 25mm KNOCKOUTS. Dimensions are for unit type arrangements employing Schneider Ringmaster non extensible ring main or circuit breaker equipments. Please also see extensive information in WPD Framework Appendix 4 relating to the design of indoor. 1. 1 THIS SPECIFICATION DETAILS THE MINIMUM PERMISSIBLE STANDARD. SUPPLIERS MAY SUBMIT ALTERNATIVE DESIGNS FOR CONSIDERATION AND APPROVAL BY THE. The Distribution Design Catalogue contains the approved standard equipment arrangements for the design of our underground and overhead distribution networks within the Western Power network. This guide explains typical wall-mount and floor-standing dimensions, how to read catalog sizes, and how to choose the right enclosure size for your layout. There is no single global chart for standard.