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Parallel groove clamps are mainly used for transmitting current between the interconnected conductors, for example for connection loops on terminal poles or tapping off bus-bars to equipment on substations. From this function it is therefore obvious that the electrical conducting properties and the corrosion resistance are the main factors for consideration in the design.

Besides this main area of application parallel groove clamps are also used for safety loops and therefore they must provide an adequate mechanical holding strength. A further area of application is the damping of vibrations as PG-clamps are used to attach the bretelle damper.

It is recommended to use two PG-clamps on conductors bigger than 17,2mm dia. PG-clamps can be used as a jumper spacer and in that case they are connected by a steel bar. It is also possible to connect two conductors of different sizes by using reduction tubes. If conductors made of different materials are to be connected this can be done by using bimetallic tubes.

Features:

• An adequate mechanical holding strength is achieved. In case of higher values two or more PG-clamps should be used in series.
• Good corona and radio interference voltage (RIV) behavior due to rounded shapes.
• Maximum corrosion resistance is achieved by using a clamp material that matches with that of the conductor, for example a corrosion-resistant AlMgSi alloy for conductors made of aluminium, al-alloy etc.
• The requirements will be fulfilled and demonstrated by heat cycle tests.
• Steel hardware is hot dip galvanized.