Junction box

OSHA requires pull boxes, junction boxes and fittings to have covers identified for the purpose, and metal covers must be grounded. A junction box holds wire splices so they are not loose in a wall, ceiling or attic.

The CPSC notes that connections at junction boxes are one place where aluminum-wire hazards occur. See aluminum wiring. A missing cover, a hot box or a splice outside a box is a hazard. Call a licensed electrician. A switch box is similar. See electrical warning signs.