What is a exposed conductive part?
[IEC 61141-3.6] “Exposed conductive part: conductive part of equipment, which can be touched, and which is not normally live, but which can become live when basic insulation fails.”
How do you determine an extraneous conductive part?
DETERMINING AN EXTRANEOUS-CONDUCTIVE-PART BY MEASUREMENT Where there is doubt as to whether Earth potential is liable to be introduced by a conductive part that is connected to the general mass of Earth, a continuity measurement should be made of the resistance between the conductive part (Rcp) and the MET of the …
What is an example of an extraneous conductive part?
Extraneous-conductive-parts. The main earthing terminal. Earth electrode(s) The earthed point of the source or an artificial neutral.
What are extraneous parts?
What is an extraneous conductive part?
- A conductive part.
- Liable to introduce potential, generally earth potential, and.
- Not forming part of the electrical installation.
Why do bonds have extraneous-conductive-parts?
Protective equipotential bonding is a method of applying a low impedance path from exposed-conductive-parts to extraneous-conductive-parts, to ensure equal potential throughout the installation thus preventing a hazardous potential difference occurring between such parts in the event of a fault.
How can you tell if a pipe is extraneous?
if the reading is not <0.05 then you need to determine whether it is extarneous or not, you can test this by applying a 500v dc IR test between the MET and the suspected part, basically if the reading is <22,000 ohms then it is extraneous if it is >22,000 ohms then it is considered isolated and need not be bonded.
What is the name of the conductor connecting the Met to an exposed conductive part?
The circuit protective conductor (increasingly called the ‘c.p.c.’) is a system of conductors joining together all exposed conductive parts and connecting them to the main earthing terminal. Strictly speaking, the term includes the earthing conductor as well as the equipotential bonding conductors.
Which type of conductor connects between the Met and an exposed conductive part?
Why do bonds have extraneous conductive parts?
Are gas pipes extraneous conductive parts?
Whilst the tank itself does not meet the definition of an extraneous-conductive-part and will not require protective bonding to be installed, it is likely that the service pipe will require bonding where it enters the installation, providing that it is metallic, introduces earth potential and enters the building.
What is the name of the conductor connecting the Met to an exposed-conductive-part?
Are gas pipes extraneous-conductive-parts?
What is an extraneous conductive part?
Although only a conductive part which does not form part of the electrical installation concerned may be an extraneous conductive part, because such an item is conductive does not necessarily mean it is liable to introduce a potential.
What is a conductive part that does not introduce potentials?
A conductive part, such as a metal duct or pipe, that is covered with, or enclosed by, insulating material, or an item that is out of reach (that is, at a distance where simultaneous contact with either exposed-conductive-parts or extraneous-conductive-parts is not possible) will not introduce a potential.
When is a tray/basket an extraneous conductive part?
1. Tray/basket would only be an extraneous-conductive-part if was liable to introduce a potential (by definition).
Do extraneous-conductive-parts require earthing or bonding?
or extraneous-conductive-parts and consequently do they require earthing or bonding? equivalent contruction (for example PVC insulated and sheathed cable). to conduct earth fault currents. The cable tray or basket which the mineral insulated and therefore it does not require earthing. To do so would only serve to distribute