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Power circuit carries high power and costly devices. If there is some unwanted power signal(noise) in the wire it can damage the device. To reduce this effect earth is necessary.

Lighting circuit carries low power(current).So, we ignore the earth terminal.

Answer for UK

Lighting cables do normally include a protective (earth) conductor, and this is terminated in each ceiling rose, as are the line and neutral conductors. Whether or not the earth terminal is actually then used depends on the luminaire (light fitting). For example, if it is simply a suspended lamp then the earth connection is not used; on the other hand, if it is a fluorescent lamp enclosed in a metal enclosure, then the enclosure is connected to the earth terminal.

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9y ago
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12y ago

To protect local residents and agencies.

Add SIM card to transfer electrical voltages caused by lightning, and a connection to the land that comes on the device.

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Q: Why it is necessary to have an earth wire installed in a power circuit but not in a lighting circuit?
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