Light weight non-ceramic insulators conform to all applicable electrical and mechanical tests as required by ANSI C29.11 and IEC 1109. All suspension insulators are given a routine test load (RTL) of 111 kN and have an ultimate mechanical load of 222 kN.
When the Emergency Restoration System is required to restore more that one transmission voltage, multiple insulators are used that can be linked together. The individual post insulators will have a minimum diameter of fiberglass reinforced resin rod required to meet the loading. Two post insulators may be linked
together to form a higher voltage insulator.