I guess I wasnt clear on this. It is The Interlockit brand of kit that us Ul "tested" for use on type 67 panelboards by an independant Lab. However the code verbage nowadays requires that you only use a device that is approved for use by the panelboard manufacturer. These kits meet the spirit of the code and are in my opinion a good product to use on oloder panels where you cant get a kit directly from the manufaturer such as Challenger,Westinghouse or the like. Nearly all the current panelboards from Siemens,Square D,Cutler Hammer etc either have a kit or a new door that can be used. I like this type of install because it gives the customer the choice as to which circuits they want to use up to the limits of thier Gen set..Unfortunatly I think most of the L&I guys are rejecting Interlockits. Other jurisdictions dont seem to care and are as far as I am concerned mor practical in the enforcement of this code area. I know the code is the code but when you have a device like this that works perfectly to do the job intended by the code re interlocking etc then I just dont see the problem. I was just wondering is anyone around here knew what the inspectors are buyinh nowadays.