Cable - Ground Wire Tab

Option Descriptions
Option	Description
Type (AC cable only)	Ground conductor type (none, interstitial, separate, or as part of a group of conductors). This choice has an effect on the zero sequence impedance calculation. See Reference² below for more information on ground impedance calculations. None: No ground conductor. Interstitial: The ground wires in a three conductor cable (or IAA, IAS, CLX, TEC). Typically, there are three bare ground wires spaced evenly between the phase conductors. Figure 2: Interstitial Ground Separate: A separate ground conductor in a conduit for a specific circuit. Figure 3: Separate Ground Group: A ground conductor in a duct bank or tray that is used for multiple circuits.
Num	Number of ground wires in the circuit. This value is for reference only and does not affect analysis.
Size	Ground conductor size. This value is for reference only and does not affect analysis. Note: The size of ground wire may not have a direct influence on the effective zero sequence resistance (R0) and reactance (X0). Refer to Kaufmann’s paper² on grounding. For steel conduits, ground currents flow through the conduit close to the outer surface because of skin effect.
Material	Ground conductor material. This value is for reference only and does not affect analysis.
Insulation	Type of insulation for the ground wire. Select <None> for bare conductor. This value is for reference only and does not affect analysis.

Type

(AC cable only)

Ground conductor type (none, interstitial, separate, or as part of a group of conductors). This choice has an effect on the zero sequence impedance calculation. See Reference² below for more information on ground impedance calculations.

None: No ground conductor.

Interstitial: The ground wires in a three conductor cable (or IAA, IAS, CLX, TEC). Typically, there are three bare ground wires spaced evenly between the phase conductors.

The conductor cables (A, B, and C) and 3 bare ground cables are inside the cable.

Figure 2: Interstitial Ground

Separate: A separate ground conductor in a conduit for a specific circuit.

Three individual cables and a ground wire inside conduit.

Figure 3: Separate Ground

Group: A ground conductor in a duct bank or tray that is used for multiple circuits.

Num

Number of ground wires in the circuit. This value is for reference only and does not affect analysis.

Size

Ground conductor size. This value is for reference only and does not affect analysis.

Note: The size of ground wire may not have a direct influence on the effective zero sequence resistance (R0) and reactance (X0). Refer to Kaufmann’s paper² on grounding. For steel conduits, ground currents flow through the conduit close to the outer surface because of skin effect.

Material

Ground conductor material. This value is for reference only and does not affect analysis.

Insulation

Type of insulation for the ground wire. Select <None> for bare conductor. This value is for reference only and does not affect analysis.

Cable - Ground Wire Tab

More Information