Natural Sciences and Technology Grade 6 Term 3: Energy and Change Electrical Conductors and Insulators

Topic 2 Electrical Conductors and Insulators Natural Sciences and Technology - Grade 6

Ceramic insulator used on railways Natural Sciences and Technology - Grade 6

Conducting copper wire insulated by an outer layer of polyethylene Natural Sciences and Technology - Grade 6

3-core copper wire power cable Each core has its own individual colour-coded insulating sheaths and all are contained within an outer protective sheath. Natural Sciences and Technology - Grade 6

PVC-sheathed mineral insulated copper cable with 2 conducting cores Natural Sciences and Technology - Grade 6

Natural Sciences and Technology - Grade 6 Types of insulators Type Used for: pin Voltages up to 33 kV and mounted on the cross arm on the pole. suspension Voltages greater than 33 kV and the wires are suspended from a 'string’ of glass disks. strain Low voltage lines less than 11 kV and it supports the horizontal load. shackle Low voltage distribution lines and they can be directly fixed to the pole with a bolt or to the cross arm. Natural Sciences and Technology - Grade 6