Hello , I have the above portable which i use on the occasion when the t/m is not suitable. EACH AND EVERY TIME I USE IT IT TRIPS THE CUSTOMERS ELECTRIC! I have got an rcd on each cable and it still switches the electric. After about the 3rd or 4th time it goes well and does a good job. Hydramaster have had it and cant find the problem, my local engineer has looked at it twice now and cant find a particular fault. Interestingly on the electrics in our wharehouse it never goes off!!!! Its got to the point where I just dont want to use it knowing that its going to be embarrasing! Sadly im not a techinical type and need some help please... Thanks Simon Coller