What does PME system mean?
protective multiple earthing
The ‘PME’ in PME supply stands for protective multiple earthing. It means that the neutral conductor is deliberately connected to earth at a number of points on the supply network. If you think of a simple network this would consist of a supply transformer, a radial distribution main and service lines to each customer.
What does PME mean electrical?
Protective Multiple Earthing
PME stands for Protective Multiple Earthing.
When was PME earthing introduced?
1970s
In the early 1970s the utilities sector introduced PME (Protective Multiple Earthing), which provided both a protective and a neutral conductor within the incoming neutral conductor.
What is a PME fault?
This fault happens on the electricity distribution system supplying the property (specifically supplies that have a “protective multiple earth” (PME) or “TN-C-S” supply arrangement) but can lead to a potentially dangerous voltage arising on any exposed conductive surface – such as your electric vehicle when it is …
Where do PME conditions apply?
Where PME conditions apply, the returning current has two possible paths, through the combined conductor and the general mass of Earth. Depending on their relative impedances some current, referred to as diverted or circulating neutral current, may return via the general mass of Earth.
Does a PME need a earth rod?
Since 2013 earth rods have been required on PME systems and the flexibility that some installers used to not fit an electrode was removed from the 18th Edition in January 2019, but the difficulty of successfully fitting an earth rod predates both regulations.
Do I need an earth rod?
It is crucial for any home to prevent a small short circuit from turning into an electrical fire. In the event your electrical systems malfunction, the grounding rod will vanish all the released current away from your property and down into the ground. Earthing is used to protect you from any kind of electric shock.
How do you test for PME?
Using a Resistance Meter, take the resistance between the Earth and Neutral cables of the circuit, if the reading is very low, say 0.03 ohms, you will have an TN-C-S (PME) installation, along with a good Earthing Connection.
What is PME fault?
In a PME system, the home’s earth wiring all runs back to the main supply point where it connects to the neutral conductor coming into the home. PME systems ensure very low neutral to earth impedance in the home and allow the RCDs fitted in your consumer unit to reliably detect earth faults.
