( another ( ( makes ( insulators ( for ( electrical ( ( wire and ) cable ) ) ) ) ) . ) )
(ROOT (S (NP (DT another)) (VP (VBZ makes) (NP (NP (NNS insulators)) (PP (IN for) (NP (JJ electrical) (NN wire) (CC and) (NN cable))))) (. .)))
another makes insulators for electrical wire and cable.
(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.