Connections in a 3 Phase Plug and Socket Explained EAL Awards City and Guilds In this video UK electrician Matt O'Dell looks at the connections in an industrial plug and socket arraignment. It's very important when interfacing an industrial plug and socket that the connection line up especially when the connections are labelled R, S and T and L1, L2 and L3. Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E. #GSHElectrical #Electricaltrai