( ( electric ( wire ( and ( cable coverings ) ) ) ) ; )
(ROOT (NP (NP (JJ electric) (NN wire) (CC and) (NN cable) (NNS coverings)) (: ;)))
electric wire and cable coverings;
(ROOT (S (NP (JJ Electrical) (NNS wires)) (VP (VBP are) (ADVP (RB usually)) (VP (VBN covered) (PP (IN with) (NP (NN plastic) (CC or) (NN rubber))) (S (VP (TO to) (VP (VB insulate) (NP (DT the) (JJ electrical) (NN wire))))))) (. .)))
Electrical wires are usually covered with plastic or rubber to insulate the electrical wire.