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In most installations in a two wire circuit the colour will be black. In a three wire circuit there will be two ungrounded conductors using a colour code of black and red.
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What is it called when wires connect accidentally?
If two ungrounded (hot) conductors touch or an ungrounded and a grounded (neutral) conductor accidentally touch, it is called a short or short circuit. If an ungrounded or a grounded conductor touch an equipment grounding conductor, it is called a ground fault.
Why doesn't a multimeter read 120 volts between the hot ungrounded conductor and the floor which is the electrical ground?
"ungrounded" = floating.
Is a grounding 120 volt receptacle larger than an ordinary receptacle?
No, it just has an additional conductor to separate the neutral from the ground, and has a third prong in the receptacle to receive the appliance grounding conductor through the cordset.
Why must a fuse always be connected in a non-earthed conductor?
It is the ungrounded conductor that carries the load current. It is that conductor that needs to be protected should a fault current occur. That is what the fuse in that circuit does.
When you encounter a four-slot receptacle in a residential laundry room?
It allows for a separate equipment grounding conductor
What is it called when wires connect accidentally?
If two ungrounded (hot) conductors touch or an ungrounded and a grounded (neutral) conductor accidentally touch, it is called a short or short circuit. If an ungrounded or a grounded conductor touch an equipment grounding conductor, it is called a ground fault.
Why doesn't a multimeter read 120 volts between the hot ungrounded conductor and the floor which is the electrical ground?
"ungrounded" = floating.
Is a grounding 120 volt receptacle larger than an ordinary receptacle?
No, it just has an additional conductor to separate the neutral from the ground, and has a third prong in the receptacle to receive the appliance grounding conductor through the cordset.
May a GFCI receptacle be installed as a receptacle in an old installation where the 2-wire circuit has no equipment grounding conductor?
Actually, yes. The GFCI does not need any ground; it measures "leakage", i.e., an imbalance, regardless of whether there is "ground". The National Electrical Code permits installing a GFCI to replace a completely ungrounded receptacle. Others have said: No. The GFCI is designed to measure an unintended path to ground. Without a good ground reference this is not possible.
Why must a fuse always be connected in a non-earthed conductor?
It is the ungrounded conductor that carries the load current. It is that conductor that needs to be protected should a fault current occur. That is what the fuse in that circuit does.
When installing an isolated circuit in a patient care area what color conductor is required to be terminated on the nickel-plated screw of a receptacle?
When installing and Isolated circuit, the orange-insulated conductor is required to be connected to the nickel-plated screw of recepticals
What is use of neutral in a wall receptacle?
The neutral in a receptacle is the return conductor to complete the circuit back to the distribution panel. When a device is plugged into the receptacle this completes the circuit and allows the current to flow and the device to operate.
Which wire goes on the ground fault receptacle?
In normal home wiring the black and white supply the circuit voltage. The green conductor connects to the green screw. The black conductor connects to the brass coloured screw and the white conductor connects to the silver coloured screw. There are additional terminals on the receptacle that connect to the down stream side of the circuit. By making these connections on the GFI receptacle all downstream normal duplex receptacles are also protected.
When you encounter a four-slot receptacle in a residential laundry room?
It allows for a separate equipment grounding conductor
What Article and Section of the National Electrical Code allows the use of a white wire as an ungrounded conductor?
Nfpa 70 2008 nec 200.7 (c) 2
What color can an underground conductor not be?
an underground conductor can be any color except white, grey or green.
GFCI circuitry often checks for a difference in current between the ground and neutral?
A GFCI monitors the current in the ungrounded (hot) conductor and the grounded (neutral) conductor. If there is more than 6mA of current difference between the two the GFCI will open the circuit.
