middle joint box for OPPC,joint boxAccording to different running ways of OPPC splicing closure,terminal style and middle style can be applied in OPPC lines.Usually,middle style splicing closure adopts electric conducting with non-insulating material to be the fiber-connecting instrument;terminal style splicing closure adopts separating high voltage with insulating material to be the fiber-connecting instrument,and two times to weld fiber in upper and lower part of splicing closure to keep security.