GLASS BRAID - Used to provide thermal and/or mechanical protection to the underlying insulation of certain types of conductors.
GPU - Abbreviation for Ground Power Unit. A GPU is a mobile power generator used typically at airports.
GRADED INDEX - In fiber optic cable the refractive index profile that varies with the radius of the core. The refractive indices decrease from the center axis out. The purpose is to reduce modal dispersion and thereby increase fiber bandwidth.
GROMMET - A flexible loop that serves as a fastening, support, or reinforcement; an eyelet of firm material to strengthen or protect an opening or to insulate or protect something passed through it.
GROUND - An object that makes an electrical connection with the earth; a large conducting body (as the earth) used as a common return for an electrical circuit and as an arbitrary zero potential; synonym for earth.
GROUND FAULT - A failure of transmission involving insulation to shield or insulation to ground wire.
GROUND POWER CABLE - A cable assembly fitted with the applicable terminations to supply power to an aircraft from a ground power unit (GPU).
GROUNDED NEUTRAL - The neutral wire is metallically connected to ground.
GRS - Abbreviation for Government Rubber Synthetic. This is a government standard for Buna-S rubber for jacketing and insulating compounds for military wires and cables.
GS - Abbreviation for galvanized steel.
GTO - Abbreviation for gas tube, sign, and oil burner ignition cable. Stranded tin copper conductor, polyethylene insulation, PVC jacket overall. Manufactured in 14 AWG for 10 kV and 15 kV service.
gu - Abbreviation for gauge.
