What is the difference between extraneous and exposed?
What is the difference between extraneous and exposed?
Exposed-Conductive-Part – Conductive part of equipment which can be touched and which is not normally live, but which may become live under fault conditions. Extraneous-Conductive-Part – A conductive part liable to introduce a potential, generally Earth potential, and not forming part of the electrical installation.
What is an exposed part?
Exposed, simply speaking, is when a person can inadvertently make contact with an energized conductor or circuit part. In it’s definition, a part is considered exposed if it is not properly guarded, isolated, or insulated. So if you can touch a bare part, then it’s considered exposed.
Is a water pipe exposed or extraneous?
Owing to the length of the plastic pipe, the high resistance limits the touch voltage to a safe value and, for this reason, a water installation pipe with more than a metre of plastic pipe on the consumer’s side of the main stopcock will not normally be considered to be an extraneous-conductive-part.
What is an example of exposed conductive part?
For example, an electrical motor is an exposed conductive part, while his metal support is not an exposed conductive part, although in the event of a failure both can become live. Every exposed conductive part, in order to be adequately protected for indirect contact (Fault protection), have to be grounded.
How do you know if something is extraneous?
It’s not that your process is wrong; it’s just that this solution does not fit back into the equation (math is very complicating sometimes). To find whether your solutions are extraneous or not, you need to plug each of them back in to your given equation and see if they work.
What is an exposed conductor?
Exposed-conductive-part: A conductive part of equipment which can be touched and which is not a live part, but which may become live under fault conditions.
What exposed electrical parts?
Exposed electrical parts may include open power distribution units, temporary lightning or detached insulation parts. These parts can cause shocks and burns. Secure the electrical parts with proper guarding mechanism and repair expose parts immediately.
What 4 items should be connected to an MET?
Current – Flowing electricity. Earth – A connection to the ground. Earthing – A way of preventing electric shocks. Electrical installation – a fixed wiring system.
Why an exposed conductive part must be connected to the Met?
These connections are intended to connect all exposed-conductive-parts and all extraneous-conductive-parts simultaneously accessible, when correct conditions for protection have not been met, i.e. the original bonding conductors present an unacceptably high resistance.
Which of the following is an extraneous conductive part?
Examples of extraneous conductive parts are: Structural metalwork of a building. Items such as heating tubes and non-electrical apparatus connected to them electrically, such as radiators and gas-fired or coal-fired cooking appliances. Floors or walls made of conductive material (see Table 1).
How do you know if a root is extraneous?
Example: you work on an equation and come up with two roots (where it equals zero): “a” and “b”. When you put “a” into the original equation it becomes zero, but when you put in “b” it doesn’t. So “b” is an extraneous root.
What is an extraneous?
1 : existing on or coming from the outside extraneous light. 2a : not forming an essential or vital part extraneous ornamentation. b : having no relevance an extraneous digression. 3 : being a number obtained in solving an equation that is not a solution of the equation extraneous roots.
Can a run of conduit be extraneous and exposed?
Im inclined to think not as its an exposed conductive part (part of the electrical system); but can it be extraneous too at the same time and so need bonding ? Another way to look at it would be the run of conduit does not need earthing as the cables are sheathed, but it does need bonding as its extraneous.
When is a pipe an extraneous conductive part?
An exposed-conductive-part and an extraneous-conductive-part are both defined in Part 2, neither definition includes proximity to a building. Ok so far. If a pipe enters a building, and it is by definition identified as an extraneous-conductive-part, it can be bonded at the point of entry to the building.
Which is an example of an extraneous use?
For example, consider a run of cable tray carrying services into a particular building. The cable tray may be in contact with the earth potential outside a building that building. In such a case the tray would warrant the defintion of an extraneous-
What is an extraneous variable in a research study?
An extraneous variable is any variable that you’re not investigating that can potentially affect the dependent variable of your research study. A confounding variable is a type of extraneous variable that not only affects the dependent variable, but is also related to the independent variable.