Applied Grounding & Bonding
Connecting electrical systems or equipment to the Earth either directly or through a conductive body.
What is Grounding?
All grounding electrodes present at each building or structure must be bonded together to form this.
What is a Grounding Electrode System?
The NEC table used to size grounding electrode conductors (GECs).
What is Table 250.66?
The required color identification for wire-type equipment grounding conductors (EGCs).
What is green or green with yellow stripes?
The conductor used to connect the system grounded conductor or equipment to a grounding electrode.
What is a Grounding Electrode Conductor (GEC)?
A single rod, pipe, or plate electrode does not require a supplemental electrode if its resistance to ground is not greater than this.
What is 25 ohms?
The NEC table used to size grounded service conductors and main bonding jumpers.
What is Table 250.102(C)(1)?
Receptacles where the grounding terminal is purposely insulated from the mounting means are installed for the reduction of this
What is electrical noise (electro-magnetic interference)?
The conductive path installed to connect normally non-current-carrying metal parts of equipment together and to the system grounded conductor.
What is an Equipment Grounding Conductor (EGC)?
An unacceptable grounding electrode because it isolates the concrete from direct contact with the earth.
What is a concrete-encased electrode with a plastic vapor barrier underneath?
The minimum copper EGC required for a 200-ampere feeder where ungrounded conductors are upsized from 4/0 copper to 800 kcmil copper for voltage drop.
What is 1/0 AWG?
The minimum number of fully engaged threads required for threaded joints at fittings and boxes in hazardous (classified) locations.
What is 5 threads?
An electrical system connected to ground without inserting any resistor or impedance device.
What is a Solidly Grounded System?
A separate building or structure supplied by a single branch circuit does not require a grounding electrode if the branch circuit includes this.
What is an Equipment Grounding Conductor (EGC)?
The minimum size aluminum equipment grounding conductor for a feeder protected by a 350-ampere fuse.
What is 1 AWG?
An example of a wiring method that is NOT recognized by the NEC as a standalone equipment grounding conductor.
What is flexible metallic tubing in a 10-foot continuous length?
The reason why the amount of current present on a GEC during normal and fault conditions is very low.
What is the high impedance of the path through the Earth?
Connectors used to connect a grounding electrode to an electrode installed in direct contact with the Earth must be listed for this.
What is direct burial?
The minimum aluminum equipment bonding jumper size for a circuit protected by a 100-ampere overcurrent device.
What is 6 AWG?
The NEC article that covers specific rules for grounding and bonding electric signs and LED sign illumination systems.
What is Article 600?