( ( If ( there ( is ( ( any ( plastic ( ( insulation or ) paint ) ) ) ( on ( ( the ends ) ( of ( the ( electrical wire ) ) ) ) ) ) ) ) ) ( , ( ( ( scrape it ) off ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT any) (JJ plastic) (NN insulation) (CC or) (NN paint)) (PP (IN on) (NP (NP (DT the) (NNS ends)) (PP (IN of) (NP (DT the) (JJ electrical) (NN wire))))))))) (, ,) (VP (VB scrape) (NP (PRP it)) (PRT (RP off))) (. .)))
If there is any plastic insulation or paint on  the ends of the electrical wire, scrape it off.
(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.