BS4568 junction box 1.BS4568 1970 class 3,class 4 2 ... 3.OEM service 4.24h on service BS4568 junction box class 4 and class 3 conduit's fittings are ... 2-way, 3-way, 4-way, Terminal Box, Intersection Box, Through Box, Tee Box, Angle Box. 2) Available sizes: 20mm and 25mm, 32mm. ... To protect conductors in threaded rigid conduit, act as pull and splice boxes, interconnect lengths of conduit, change conduit ...