Scaffold Resource uses products chosen specifically to meet the unique requirements of each job. When dealing with a structure as historic and noteworthy as the Mid-Hudson Bridge, Scaffold Resource made sure to protect the bridge itself as well as the travelers below.
GFCI (ground-fault circuit-interrupter) protection is required for many receptacles (outlets) throughout the house and outdoors. This protection can be provided either by a GFCI breaker or GFCI receptacles. There are advantages and disadvantages to each approach, depending on the installation.
A ground fault circuit interrupter is not the same thing as a circuit breaker. A GFCI is intended to prevent stray currents from causing shock hazzards. As the answer states, it measures the current difference between the hot wire and the nuetral. I the current difference exceed 0.2 amps, the GFCI opens the circuit.