This document provides specifications for various types of plastic distribution boxes, including their dimensions and features. Wiring diagram shows both PNP and NPN wiring. Dimensions are shown in mm (in. 81 ft)]. ket of low voltage electric insulating switchboards and industrial boxes. No matter how ha sh the environment is, there is always a proper enclosure for your needs. Thanks to protection ratings and high quality ble (from 65 x 65 mm up to 361 x 254 mm) plus 3 different cover hei xes are available. FLAMEPROOF MULTI WAY DISTRIBUTION BOX. : Anti corrosive Epoxy powder coated : Refer Chart. 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.