Standard test finger

[RegElec]

Does anyone know what the dimensions are of the standard test finger.

I currently have a stainless steel Attachment 5904industrial DB which has C/B's, terminals and E/L's mounted on DIN rail. The common bus-bar on top of the C/B's are all of the insulated type. All the internal wiring is through narrow slot PVC trunking. There is a solid door on the front which can be opened without the use of panel key.

I personally feel that the screw connections at the DIN C/B's and terminals are quite recessed and that it would take quite an effort to be able to touch the terminals and receive a shock hence the question on the standard test finger. I am reluctant to cover all the connection point with perspex or similar.

Any thoughts on this.