In electrics and electronics there is an expression about something being earthed/grounded. Basically means that it's hooked up to something which is at zero voltage. An earth wire simply is a wire leading to a zero voltage spot.
The definition of connecting wire is a piece of wire used to attach two circuits or components together. The gauge or size of the wire must be large enough to support the amount of current flow.
"Under the wire" means shortly before the deadline, e.g., "I caught the train just under the wire," or "I reached the destination of the interview just under the wire." It means "barely" or "scarcely."
it mean wire
Earth
The possessive form for the common noun earth is earth's; for example, the earth's dryness. The possessive form for the proper noun Earth is Earth's; for example, the Earth's circumference.
A 6 mm earth wire can be used to replace a 2.5 mm earth wire, but if there is an existing 6 mm earth wire it must be 6 mm all the way to the earth, and not replaced by a smaller wire between it and the earth connection.
It is the earth wire
By earth wire I am assuming you mean the bare wire and that a black and white wire are connected to the light. If when you connect the earth wire and breaker trips then there is a short between black and earth. It could be a bad ground connection, an internal short in the light fixture where black wire "hot" is connected to metal on the fixture through a nick in wire.
Earth wire
In the visible spectrum or the infrared? Either way, if your earth wire is glowing you have a problem. Your earth wire is not intended as a current carrying wire. If the wire is loaded to the point that it glows then your circuit/breaker is not wired correctly and the earth wire is being used as an unintended path and is a hazard. Earth wires are not sized properly to carry current.
it is the earth wire
earth wire not cnnected from main earth
large current flows from live to earth wire.
The earth wire.
It is earth wire
It is earth wire
It is earth wire for protection