Why do lamps installed in the ground need earthing?

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Recently installed some lights that are sunk in the ground. They had connections for the earthing / ground cable, which I did connect and test to be sure. But I would like to understand why this is required in the first place given that the lamps are literally in the earth. Thanks.

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15 Answers

Anonymous 0 Comments

You don’t want to ground something at the surface. The ground cable connects deeper into the ground to make sure the current is dissipated where it can’t harm people.

If you ground something right at the surface you get a voltage profile in the surrounding soil wich might hurt someone standing there (depending on a bunch of factors from humitity to the distance between their feet).

So the lamp itself would certainly be grounded, but in case of a fault (short to ground) you might cause harm.

Anonymous 0 Comments

[deleted]

Anonymous 0 Comments

[deleted]

Anonymous 0 Comments

You don’t want to ground something at the surface. The ground cable connects deeper into the ground to make sure the current is dissipated where it can’t harm people.

If you ground something right at the surface you get a voltage profile in the surrounding soil wich might hurt someone standing there (depending on a bunch of factors from humitity to the distance between their feet).

So the lamp itself would certainly be grounded, but in case of a fault (short to ground) you might cause harm.

Anonymous 0 Comments

[deleted]

Anonymous 0 Comments

You don’t want to ground something at the surface. The ground cable connects deeper into the ground to make sure the current is dissipated where it can’t harm people.

If you ground something right at the surface you get a voltage profile in the surrounding soil wich might hurt someone standing there (depending on a bunch of factors from humitity to the distance between their feet).

So the lamp itself would certainly be grounded, but in case of a fault (short to ground) you might cause harm.

Anonymous 0 Comments

I would imagine it’s to do with where they are installed. Imagine you had a large flowerbed built from wood or concrete, the lights would not be technically connected to ground per se. Or the entire garden could have been built upon an area that would be electrically separated from the ‘ground’.

Anonymous 0 Comments

I would imagine it’s to do with where they are installed. Imagine you had a large flowerbed built from wood or concrete, the lights would not be technically connected to ground per se. Or the entire garden could have been built upon an area that would be electrically separated from the ‘ground’.

Anonymous 0 Comments

I would imagine it’s to do with where they are installed. Imagine you had a large flowerbed built from wood or concrete, the lights would not be technically connected to ground per se. Or the entire garden could have been built upon an area that would be electrically separated from the ‘ground’.

Anonymous 0 Comments

Because if you relied solely on the contact it makes with the surrounding soil you would be at risk of being zapped after a rainfall, for example.