In some applications, such as those found in the paints and coatings industry, the benefits of a self-testing clamp are clear, enabling the operator to ensure that it has penetrated through accumulated layers of product.  However, it is possible that the LED may become obscured by such product.  In these situations, a self-testing clamp with "remote" indicator LED and battery, mounted on the wall, may provide a solution.

A second benefit is that other, smaller clamps may be used with the monitoring unit, as dictated by the application.

BS5958 states that when mixing and blending:  all metallic parts of the equipment should be connected together and earthed so that the resistance to earth at all points is less than 10 Ohms.  (10.2.1).

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