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In page TWA Flight 800:
"Because a combustible fuel-air mixture will always exist in fuel tanks, Boeing designers attempted to eliminate all possible sources of ignition in the 747's tanks. To do so, all devices are protected from vapor intrusion, and voltages and currents used by the fuel quantity indication system (FQIS) are kept very low. In the case of the 747-100 series, the only wiring located inside the CWT is that associated with the FQIS.[citation needed]
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