The Electrical Terminal Blocks must be constructed so that creepage and clearance distances between lines, as well as line and ground, are maintained. The insulation construction must prevent contact with current-carrying surfaces in an attempt to eliminate the possibility of accidental shock. This is accomplished on the terminal blocks by recessing screws and terminals so they are screwdriver accessible only. In this case, screwdriver accessibility means that the standard test finger, which is described in international standards, cannot touch current-carrying surfaces when the terminal block is assembled with wires in place. Check the appropriate appliance standard for selection of the correct terminal block.
Ratings and Approvals
China Connector Manufacturers’s ratings on the terminal blocks carried by Interpower vary, depending on the application. Ratings are also based on if they are used internationally or in North America. They have a voltage rating range of 300V-500V. Their amperage ratings are from 10A to 70A. Again, these are dependent on applications and approval country. Approval documents can be reviewed for verification of ratings.
There are different styles of terminal blocks. Interpower has chosen to carry the line of terminal blocks which are recognized worldwide. They are able to have these approvals due to their design. They have a feature called “touchproof”. The terminal blocks are designed in such a way that the screws are impossible to touch with a human hand. The only way to access the screws is with a screwdriver. Terminal blocks that do not have this feature are not recognized in the global market.
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