Printed-circuit boards must be good insulators for fairly obvious reasons. Insulators are commonly seen on telephone poles. The biggest are seen hanging from the arms of high-tension or high-voltage towers, where they keep the current going through the wires from leaking through the tower to ground.
In"su*la`tor (?), n.
One who, or that which, insulates.
2. Elec. & Thermotics
The substance or body that insulates; a nonconductor.
© Webster 1913.
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