Double shutter shroud and tunnel for MCC bus connections

A retrofit kit for a connective member between a stab of a motor control center unit and a power bus, comprising:

• a first shroud configured to be mounted on the power bus located at a back side of a motor control center section configured to house the motor control center unit, the first shroud surrounding a first access way for receiving the stab of the motor control center unit;
• a first gate slideably mounted on the first shroud, the first gate being biased to a closed position of the first gate configured to block the first access way from receiving the stab of the motor control center unit, the first gate being configured to slide into an open position of the first gate to receive the stab when the motor control center unit is inserted into the motor control center section;
• a second shroud configured to be mounted on a back wall of the motor control center unit, the second shroud being aligned with the first shroud, the second shroud surrounding a second access way for passing the stab of the motor control center unit toward the power bus;
• and
• a second gate slideably mounted on the second shroud, the second gate being biased to a closed position of the second gate and configured to block the second access way from passing the stab of the motor control center unit toward the power bus, the second gate being configured to slide into an open position of the second gate to allow passage of the stab when the stab is advanced toward the power bus, the first access way of the first shroud and the second access way of the second shroud forming a protective tunnel when the first gate and the second gate are open.

A motor control center unit, comprising:

• a housing configured to be inserted into a motor control center section, the housing including an outer structure comprising side walls, a back wall, and a front door hinged to one of the side walls and configured to open a front side of the housing to provide access to an interior space, the back wall of the housing being configured to be located adjacent to an electrical power bus when the housing has been inserted into the motor control center section;
• stabs configured to project through a plurality of apertures in the back wall of the housing, to mechanically and electrically engage the electrical power bus for electrical connection therewith, when pushed in a backward direction toward the electrical power bus, the stabs being electrically connected to electrical components located within the housing;
• a connect/disconnect handle located on the front side of the housing, coupled to the stabs, the connect/disconnect handle being configured to push the stabs to connect the stabs to the electrical power bus or pull the stabs to disconnect the stabs from the electrical power bus;
• a connective member between the stabs of the motor control center unit and the electrical power bus, comprising:
• a first shroud mounted on the electrical power bus, the first shroud surrounding a first access way for receiving a respective one of the stabs of the motor control center unit;
• a first gate slideably mounted on the first shroud, the first gate being biased to a closed position of the first gate that blocks the first access way from receiving the stab of the motor control center unit, the first gate being configured to slide into an open position of the first gate to receive the stab when the motor control center unit is inserted into the motor control center section;
• a second shroud mounted on the back wall of the motor control center unit, the second shroud being aligned with the first shroud, the second shroud surrounding a second access way for passing the respective one of the stabs of the motor control center unit toward the electrical power bus;
• and
• a second gate slideably mounted on the second shroud, the second gate being biased to a closed position of the second gate that blocks the second access way from passing the respective one of the stabs of the motor control center unit toward the electrical power bus, the second gate being configured to slide into an open position of the second gate to allow passage of the respective one of the stabs when the respective one of the stabs is advanced toward the electrical power bus, the first access way of the first shroud and the second access way of the second shroud forming a protective tunnel when the first gate and the second gate are open.