Being sheathed on one side only, it has very little residual heat and stands up to 650°C temperature for its surface area. Elimination of the sheath on the contact side puts the rock hard refractory in direct contact with the heated surface, thereby providing slightly faster heat-up. Half Sheath elements can be used where the protection provided by the full sheath is unnecessary.

Fully Sheathed Heaters (both sides metal) provides extra protection from rough handling & usage, especially when there are chances of falling any liquid on it.

1. Always use the largest possible numbers of heaters in order to reduce the density in Watt for sq.cm.
2. Ensure the base of the surface is flat to ensure maximum thermal contact with the heating elements.
3. The Heaters shall be so installed so that the Ratings are easily visible when required to be replaced in case of faults or for checking after installation.
4. The installation shall be such that Mains parts are not be exposed, easily accessible and touched by finger.
5. Install heat insulation to avoid excess heat loss but do not back directly against the element.
6. Use heat resisting wires for electrical connections. Protect lead exit from contaminations by electrically conductive substances, mechanical shock, excessive flexing, excessive temperature & moisture.
7. Use crimped lugs of appropriate size and construct it so that no strands are loose. Shall be tightened with appropriate torque so that there is no loose connection.

Cast-iron clamps, for ring elements, retain their strength at elevated temperatures to assure maximum sheath-to-surface contact. Resulting uniform efficient heat transfer from internal resistance wire to the heated material minimize hot spots on the element, contributing to long service life.