The XS600 is the Electrical Safe Isolation kit by Regin which supports the safe isolation procedure as described in ‘Technical Bulletin 118’ from gas safe. TB118 was brought out by gas safe to ensure heating engineers working on boilers follow the correct procedure to isolate and check the boiler is ‘dead’ before working on the system. This kit provides a ‘Two Pole Tester’, and ‘Proving Unit’, and a ’Locking off device’ which are all required for effective safe isolation.