Junction box for photovoltaic module

A junction box assembly comprising:

• a cable connecting box having an insulative box and a wire connecting module, the wire connecting module having an insulative block, a plurality of contacting foils retained in the insulative block and a plurality of diodes connecting with every two neighbor contacting foils:
• a cover covering the insulative box, the cover having a separating wall extending downwardly from a periphery of the cover and a preventing blade extending downwardly from a rear side of the separating wall,
• a protrusion formed on one of the preventing blade and the insulative box, and a locking hole formed in the other of said preventing blade and the insulative box to lockably receive said protrusion;
• a latch portion formed on a front side of the separating wall to cooperate with the protrusion to symmetrically secure the cover to the insulative box;
• and
• a cable connecting with the contacting foils.