How to keep the earth clean and safe

How to keep the earth clean and safe

How to keep the earth clean and safe

The earthing connections for conditioners installed to isolate noise are very important.The unit is designed to isolate the load from the building earth as well as to provide voltage stabilisation and noise attenuation.
The earth on the protected load may be connected to the safety earth but it must be realised that noise spikes on the safety earth may cause problems.
This applies to so-called 'clean' or 'dedicated' earths run from the main building power distribution box.
Ideal installations have the input of the conditioner protected by the safety earth and a separate clean earth provided for the critical load.
This can be achieved by an earth rod, water pipe (when suitably tested), or structure in tall buildings.
Many electrical systems include an earth, but not all, this page simply sets out the different types of earth used in Power Conditioning and in particular tries to define a 'Clean Earth'.
A circuit point or a connection line can be said to be correctly earthed if, within the frequency range under consideration, the impedance (Z) between this point and earth is lower than 5 Ohms.
An electrical shock comes from placing a part of your body in such a way as to complete an elctrical circuit, since current can't flow without a complete circuit there are two main differing approaches to minimising the risk of electrical shock.
UK domestic applications are all earthed, the most common system being used is Protective Multiple Earthing (PME). In PME systems a typical mains incomer consists of two or three cores (live and neutral with or without a separate earth), modern installations use metal shielded cables where the shield is also earthed. At the Distribution point of the House all of the earth potentials are bonded together on a main Earth bus bar and (if available) a further link is taken to any incoming water or gas pipes that are metallic and emerge from underground.
In this way many routes to earth are available and the impedance of the earth is likely to be low even if one link fails. Industrial applications are basically the same although three phase supplies can be in several different configurations in the UK, in all of these the Neutral is bonded to earth at the sub-station.
A large proportion of electrical devices contain some form of electriconic component many of which require a reference 'zero' or 'ground' for optimal operation. Noise (in the form of AC or DC signals) on this zero reference can lead to unexpected results including failure of the electronics.
Because the Earth is multiple bonded and common to all systems connected to the supply it is possible for it to become 'contaminated' with signals. Some equipment is particularly bad at generating common mode noise others are particularly sensitive to it. Effective isolation of either the source or the sensitive system is an effective way of reducing the problem.
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