It describes HA, HK, and LGD series boxes with dimensions ranging from 100-415mm in length, 105-323mm in width, and 75-140mm in height. Dimensions included are length, width. Large electrical power distribution boxes come in several sizes—single-gang for one device, double-gang for two, and so on. Check out this quick guide: Think about how many devices you need, where you will install the box, and the environment. It is an indispensable electrical equipment. If there are some potential safety hazards, we can deal with them in time. These dimensions control how your product fits, how much space your shipment occupies, and how your packaging performs across storage, handling, and delivery.