When current transformers are operated open circuited, extremely high voltages can be generated with resultant damage to equipment and personnel.

Before removing a load such as a meter or relay, the CT should be short circuited using a shorting block. The ungrounded secondary of a voltage transformer and the line side of the power supply should be fused before connecting to a device such as a meter or relay. manufactures several models of shorting and test blocks.

Example of a shorting blockAll products are CSA and UL approved.

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ShortingBlocks.Com is managed by Langford & Associates Inc.

Langford & Associates are Manufacturers Representatives for various companies in the Power Sector.

Visit Langford & Associates' website for more information on the products we represent.

Related site recommends Power Measurement Ltd. for digital power meters and monitoring solutions. Visit their web site by clicking here