For the uniform distribution of heat

To prevent the heating element from coming out of grooves

To reduce the space for coiled heating element

To increase the resistance of the heating element

Copper

Silver

Aluminium

Brass

Low co efficient of expansion

Low specific resistance

Low mechanical strength

Low voltage withstanding

Not more than 5%

Not more than 8%

Not more than 10%

Not more than 12%

Looping out from switches

Distribution system

Ring main system

Tree system