Seaward 3 phase adaptor delta 4 pin 16a seaward 209a910 which seaward pat tester is best for you a href seaward style display inline block background d13631 color white text decoration none padding 5px font weight bold border radius 3px help me decide a p se delta 16 4 pin 16a 415v p p this adaptor allows earth continuity and insulation resistance measurements to be made on 3 phase equipment using pat testers with a standard uk 240v test socket p seaward 209a910 3 pha