Other

Hubbell Limited

W Reid Smith-Vaniz

Thomas M McDonald

William P Shine

Jay L Carley

Victor Kuring

Richard H Darling

A personnel protection system for electrical connections is disclosed, which is of the type that differentially senses the current flow between the power lead and the return lead (or between two power loads) is provided with an unbalancing impedance which makes the current difference between the two leads sufficiently high to trip the device and cause the power to be disconnected. A utilization device is similarly provided with an imbalanced impedance. However, that impedance is calculated to counteract the current imbalance caused by the first impedance, so that when the cable is connected to the utilization device, the current balance between the two conductors is restored, and power connection is maintained in the cable. In addition, the current flow in the second impedance is sensed and, if it is not at the correct level, electrical power to the load is disconnected in the same manner as when an imbalance occurs. Thus, the system does not provide continuous power unless predetermined conditions considered safe for securing the power are fully satisfied.

Personnel protection system for electrical power connections

The color-coded index tab is produced automatically by passing a tape through a label applying machine which is programmed by a computer to apply color-coded labels at precise locations of the tape. The tape is afterwards severed to produce the individual index tab for subsequent application to a file holder. The index tabs can be folded or not about the longitudinal center line so that the block of color on each label can be exposed around the edge of the file holder or on a flat edge surface of the file holder for viewing purposes. The individual index tabs and labels can be sized to present any number of different color coded blocks.

System for making color-coded index tabs

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Darien, CT, United States of America

W Reid Smith-Vaniz