Power distribution unit with individual GFI modules and a line supervisory circuit
First Claim
1. A power distribution unit for supplying temporary branch power, comprising:
- a. a 240-250 VAC input having at least input power line conductors L1 and L2, a neutral conductor N and a ground conductor G;
b. a supervisory circuit for checking that the 240-250 VAC input is properly connected to the power distribution unit by requiring that the input voltage exceeds a supervisory circuit threshold voltage substantially greater than 120-125 volts VAC;
c. a contactor, enabled by the supervisory circuit, for closing first and second contacts therein to pass the 240-250 VAC on lines L1 and L2 therethrough to a 240-250 VAC ground fault interrupter protected circuit breaker outlet;
d. wherein the neutral conductor N bypasses the contactor to provide a bypassed neutral conductor N;
e. at least one 120-125 VAC GFI module outlet connected across one of lines L1 and L2 at the output of the supervisory circuit and the bypassed neutral conductor N.
1 Assignment
0 Petitions
Accused Products
Abstract
A power distribution unit for supplying temporary branch power has a 240-250 VAC input with input power line conductors L1 and L2, a neutral conductor N, and a ground conductor G. A supervisory circuit checks that the 240-250 VAC input is properly connected to the power distribution unit by requiring that the input voltage exceeds a supervisory circuit threshold voltage substantially greater than 120-125 volts. When that occurs, a contactor is enabled by the supervisory circuit to close first and second contacts therein to pass the 240-250 VAC on lines L1 and L2 therethrough to a 240-250 VAC ground fault interrupter protected circuit breaker outlet. A plurality of 120-125 VAC GFI module outlets are connected across either one of lines L1 and L2 at the output of the supervisory circuit and the neutral conductor N which bypasses the contactor. The supervisory circuit includes a diode bridge circuit connected across power line conductors L1 and L2 to convert a 240-250 VAC input to 240-250 VDC. A voltage threshold zener diode is connected in series with first and second relays across the 240-250 VDC, such that the zener diode ensures that the voltage required to operate the first and second relays is substantially greater than 120-125 VDC. The first relay operates contacts to activate the contactor, and the second relay operates contacts to bypass the neutral conductor N around the contactor.
57 Citations
12 Claims
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1. A power distribution unit for supplying temporary branch power, comprising:
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a. a 240-250 VAC input having at least input power line conductors L1 and L2, a neutral conductor N and a ground conductor G; b. a supervisory circuit for checking that the 240-250 VAC input is properly connected to the power distribution unit by requiring that the input voltage exceeds a supervisory circuit threshold voltage substantially greater than 120-125 volts VAC; c. a contactor, enabled by the supervisory circuit, for closing first and second contacts therein to pass the 240-250 VAC on lines L1 and L2 therethrough to a 240-250 VAC ground fault interrupter protected circuit breaker outlet; d. wherein the neutral conductor N bypasses the contactor to provide a bypassed neutral conductor N; e. at least one 120-125 VAC GFI module outlet connected across one of lines L1 and L2 at the output of the supervisory circuit and the bypassed neutral conductor N. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification