Abstract: A flame-retardant shield or cap for isolating a fastener securing a high current connection to a conductor in a power distribution box (PDB) is manufactured separately from a much larger PDB cover that is not made from flame-retardant material. The cap has a closed end and sides forming an inner chamber for isolating the fastener from the cover and a surface of the PDB on which electrical components are received and mounted. The closed end and sides of the cap snap into a cup-shaped extension positioned on an underside of the cover such that when the cover is closed over the PDB an open end of the cap receives the fastener.