The flex area coverlays have multiple selective openings exposing the
ground circuit. The films have an electrically conductive adhesive, so, once laminated, the adhesive extends into the coverlay openings and bonds onto the exposed ground, thus grounding out the shield layers.
ONE OTHER TIP: OPENING A
GROUND CIRCUIT DOES NOT CURE A CIRCUIT BREAKER TRIPPING PROBLEM.
Thieves typically target copper wire and cables that run the length of power poles, providing a potential
ground circuit for current if equipment fails or live wires fall.
BESIDESthe ordinary gallops routine, there has been plenty of swimming and a daily 25-minute run round a demanding sand and broken
ground circuit. The first two race-rides were no great conditioners because neither horse was very willing.
Sensing the ground side at a power supply, for instance, introduces impedance into the
ground circuit that causes a host of difficulties with which most engineers are vividly familiar.
The circuit will shut down high voltage in less than 1 ms if leakage in excess of 450 [micro]A is detected through the
ground circuit.
The specific technique for installing an isolated
ground circuit is not described in the NEC.
And for goodness sakes, opening a
ground circuit does not cure a circuit breaker tripping problem.
Common European requirements limit
ground circuits from crossing PCB.