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Bath grounding: why you need it and how to do it right

In this article we will deal with the question of how the grounding of the bath is performed and why should it be done at all?

Probably, many are familiar with the situation when, when touching metal products in the bathroom, there is a slight tingling sensation with an electric current – many people try to ignore such a nuisance.

How to properly ground the bath

  • Bath grounding: why do it
  • How to ground the bath: materials used
  • Varieties of baths and features of their grounding

However, you should not joke with this. In a certain situation, such light tingling with an electric current can turn into a strong discharge that can kill a person.


Bath grounding: why do it

With the fact that the lack of grounding can become a source of quite serious troubles, to say the least, we figured it out, now let’s take a closer look at the purpose of the grounding loop in rooms with a humid environment. In short, the protective grounding of the bath is intended not only for its safe operation, but also for equalizing the electrical potential of all conductive surfaces.

In general, if we talk about grounding, then you need to consider it in a comprehensive manner, together with all the current-conducting products available in the bathroom. Only in this case, connecting the bath to the ground loop will make sense.

Surely now many have a question, and what to connect the bath to? Where to get the ground loop? We’ve long since cut old steel water pipes and replaced them with new, plastic ones. This is not to say that you got excited, but grounding the bathtub to water pipes is not the only correct solution. It’s just that in such a situation, you will additionally have to lay one single wire from the dashboard to the bathroom, to which you can connect all conductive objects. But more on that later, but for now let’s figure out the question of how to ground the bath and what materials will be needed for this?

Bath grounding: why you need it and how to do it right


How to ground the bath: materials used

If the question, how to ground the bath, I was asked about 20 years ago, then, undoubtedly, the answer would be “steel cable” or “wire six”. Now times have changed, and this issue is being resolved more culturally – a copper twisted ground wire is used for the bath, which is connected with no less cultural crimps and terminals.

Bath grounding: why you need it and how to do it right

Not every wire is suitable for grounding the bath – according to the requirements, its cross-section should not be less than 6 square millimeters. Exactly the same cable will need to be laid from the electrical panel, or rather from its central grounding terminal. To connect the central grounding conductor and wires coming from other metal objects, as a rule, a special steel bus with screw terminals is used. If we talk about the folk way, then this is a bolt with a nut and washers – each individual wire must be located between two washers. The bolt is clamped with full force.

Varieties of baths and features of their grounding

If you think that an acrylic bathtub is a dielectric and does not need to be grounded, you are wrong. It, like other similar products, has a metal frame, and a liquid that is not a dielectric is filled into it.

By the way, the liquid in the bathtub is somehow connected with the water in the water supply system and other plumbing fixtures – a kind of contour is formed along which the static voltage moves, regardless of the material from which the bathtub is made. That is why it is necessary to ground not only the cast-iron and steel bathtub, but also the acrylic one. I will say more, according to all the rules it is necessary to ground even the shower cabin.

Now a little more detail on how to ground the bath, depending on the material of manufacture.

  1. Grounding the cast iron bath. If we are talking about connecting a modern cast-iron bath to the ground loop, then everything is simple – it already has a special eyelet with a hole made at the factory. The so-called petal is just used to install a bolt with a nut and washers in it, through which the ground wire is connected to the cast-iron bath. Things are a little more complicated with old cast-iron bathrooms – earlier such a petal was not provided for, and it will have to be made independently. The situation is a little complicated by the fact that it will not be too correct to connect the ground wire to the legs – there is no proper contact between them and the bathroom itself. This issue is solved as follows. In the area where the legs are installed, there are special processes from the body of the bath, which serve to wedge the legs – here in them it will be possible to drill a hole up to 10 mm deep, cut a thread in it with a tap and screw in a screw with a washer and a nut, thus providing a reliable grounding contact directly itself cast iron bath body. Alternatively, consider the fenders of the bathtub – you can also drill holes up to 5mm in them. In this case, you have to guess with the screw length.Bath grounding: why you need it and how to do it right
  2. Grounding the steel bath. Grounding a modern steel bathtub does not present any problems at all – as in the case of cast iron, it has a special lug to which a grounding cable is connected. There is, however, one caveat – in order for the grounding to be complete, around the hole in which the crimp screw is installed, you will need to clean the enamel right down to the metal itself.
  3. Grounding the acrylic bath. It was already mentioned above that acrylic is a dielectric and does not conduct an electric current, but like all similar materials, it is capable of generating static voltage on its own, which accumulates on the metal frame of this bath – it is this that must be grounded. In most cases, a grounding lug is provided on the frame, but in some designs it is absent. This issue is solved, as in all previous cases, with the help of a drill and a drill – a hole is made into which a crimp screw is installed. Remember to remove paint around the hole – it is a dielectric!

This is how the issue of grounding in the bathroom is solved with almost all metal products – a wire, a hole and a bolt with a left-hand thread. Just kidding. Most products, especially powerful consumers of electrical energy, are already equipped with terminals or at least holes for connecting the ground loop.

Bath grounding: why you need it and how to do it right

And in conclusion, a few words about the grounding of the whirlpool bath, or, as it is now called, the jacuzzi. The question of how to make grounding in a bathroom equipped with a similar plumbing fixture should be solved first of all – this is your safety! You should know that you are going to take a bath, which is crammed with all kinds of electrical equipment.

The jacuzzi must be grounded with a separate powerful cable, one end of which is connected directly to the plumbing fixture itself, and the other to the grounding input to the house (usually it is located before the switchboard).

This is, in principle, everything you need to know about how to ground the bath. To summarize all of the above, we can distinguish three main points, based on which such work is carried out: a powerful copper cable with a cross section of at least 6 squares, reliable contact and connecting the bath directly to the ground loop to the distribution board. And finally, let me remind you about such a product as an RCD – all electrical wiring in the bathroom must be connected through it without fail. published by econet.ru

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