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I will assume that your question is in reference to CT and transformer polarity.

In the case of a CT (Current Transformer) they have to be installed in the correct direction for proper metering. The polarity check is used to verify that they are installed correctly and that the polarity marks are correct (if the CT has them).

In the case of a transformer there are two types of polarity, additive and subtractive. If you are paralleling Transformers you have to ensure that they are the same type polarity in addition to other attributes.

Hope this helps.

Alternative Answer

In a new electrical installation, a polarity test is conducted to ensure that socket outlet terminals are correctly wired (line really is line, neutral really is neutral, and the protective conductor (earth/ground) really is protective conductor. It's also important, for example, that the centre pin on an Edison Screw lampholder is connected to line, and not to neutral.

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14y ago

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