( This ( ( ( is ( ( kind of ) ( like ( ( an ( electric wire ) ) ( with ( rubber ( or ( plastic insulation ) ) ) ) ) ) ) ) ( around it ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (ADVP (ADVP (NN kind) (IN of)) (PP (IN like) (NP (NP (DT an) (JJ electric) (NN wire)) (PP (IN with) (NP (NN rubber) (CC or) (NN plastic) (NN insulation)))))) (PP (IN around) (NP (PRP it)))) (. .)))
This is kind of like an electric wire with rubber or plastic insulation around it.
(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.