why wiring is always inside plastic pipes,attached with the walls.?

Answer 1

Wiring that is readily accessible, like in your garage, is required by code to be protected from physical damage, either by rigid metal or plastic conduit, or by flex conduit. Furthermore, wiring that will be installed or modified at a later date, including commercial and industrial applications, has to be in a conduit so that you can run a fish line through it. However, wiring in the home in inaccessible areas, like inside the wall or overhead in the attic, does not need physical protection and Romex is commonly used.

Answer 2

During construction of building(walls), these plastic pipes are placed in between the concrete or bricks, or outside walls so that after construction is completed the wires can easily slide through these pipes to required destination port/electricity outlets. Similarly new wires can be easily inserted and old ones can easily removed, and wires can easily bent at turns. They provide a path like water pipes, along with protection.

Answer 3

If "electrical" wiring is in a living space the codes usually say
they have to be enclosed in conduit. This is so that you cannot
accidentally cut them, or get them wet, or mice will not chew on
them ... to protect them from physical damage or handling.

Conduit does not have to be plastic though, much electrical
conduit is metal, galvanized pipe. That way if something does
short or get cut it will flow to ground through the conduit and
trip the breaker without hurting anyone.

If you have wires or cables running in areas where it is not
living space, for instance under a house you are often allowed
to run cable like Romex or insulated wires.

It is for protection and safety basically.

Answer 4

not sure what wires your looking at or what part of the world you're in but interior electrical wires are almost always found in metal conduit. not plastic pipes. acts as protection and ground

Answer 5

It is called conduit and is used to protect the wiring in certain situations. For example, in an industrial environment, wiring can be exposed to flammable mixtures of gas. It is required by code to protect the wiring by the use of conduit or armored cable.

Answer 6

Wires aren't allowed just to be exposed!

Answer 7

It keeps them all together where they can be more easily worked on and not in contact with anything flammable.

Answer 8

Because the plastic doesn't conduct electricity.