A researcher was switching a glove-box from catalyst regeneration mode to normal operation. The researcher opened a ball valve on the back side of the glove-box to put the re-circulation blower back in-line. When the researcher opened the ball valve, the valve pinched a 115V electrical cord that had been draped over the valve. The power cord was plugged into a 115 V 20 amp circuit supplying power to an environmental testing chamber (i.e. oven). The pinching of the electrical cord caused an internal short in the cord which subsequently tripped the circuit breaker. The researcher was not injured nor did he receive an electrical shock.
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