Types Of Cable Containment Flashcards
Define conduit containment.
Pole or tube like containment to hold cables and isolate them from the elements.
Define trunking containment.
Rectangular prism shaped container to hold cables and isolate them from the elements. Additionally, they are made with a lid on top.
Define trays.
A metallic plate on the ceiling yo hold cables. Made noticeable with tiny holes.
Define baskets.
Less solid plate on the ceiling to hold cables. One can more visibly see the cables in comparison to a tray.
What does PVC stand for?
Polyvinyl Chloride. The material used in the plastic.
How is earthing made possible for metallic containments of all kinds?
Earthing continuity can be completed by fixing a copper or aluminium strap across all joints.
List 3 advantages of PVC material.
Lightweight and easy to handle.
Easy to cut or deburr.
It’s simple to form and bend.
Minimal condensation due to low thermal conductivity.
Excellent electrical and fire resistant properties.
List 3 disadvantages of PVC material.
PVC expands as much as 5× as much as steel. Expansion must be allowed for.
Proper accuracy is needed when glueing joints, as this could cause a barrier or an exposure to water.
Not suitable to install in very low or high temperature places.
List 2 advantages of steel material.
Minimises fire risks.
Affords excellent mechanical protection.
List 3 disadvantages of steel material.
Expensive option compared to other wiring systems.
Liable to corrosion where exposed to acids, alkalis, and fumes.
Moisture can build up inside under certain conditions.
How tightly can one pack a conduit or trunking container and why?
Up to 45%. This is to minimise the possible build-up of heat when there are excess cables involved.
In selecting a conduit or trunking size, what do you multiply the factor by?
You multiply it by the number of runs.
Ex. 39×4
