Which statement about Type IGS cables is true?

Which statement about Type IGS cables is true?

• A. Max ampacity is 168 amps
• B. Max ampacity is 320 amps
• C. Max ampacity is 430 amps
• D. Max ampacity is 206 amps

Answer: (A)

Ampacity is the maximum continuous current a conductor can carry without overheating its insulation under the given installation conditions. For Type IGS cables, the published ampacities are derived from the conductor size, insulation temperature rating, and how the cable is installed. In the standard setup assumed by this question, the Type IGS configuration has a published maximum of 168 amps. The higher values would require larger conductors or different temperature ratings or installation conditions, which aren’t implied here. So 168 amps is the correct, best-match rate for this Type IGS cable in the standard context.

Ampacity is the maximum continuous current a conductor can carry without overheating its insulation under the given installation conditions. For Type IGS cables, the published ampacities are derived from the conductor size, insulation temperature rating, and how the cable is installed. In the standard setup assumed by this question, the Type IGS configuration has a published maximum of 168 amps. The higher values would require larger conductors or different temperature ratings or installation conditions, which aren’t implied here. So 168 amps is the correct, best-match rate for this Type IGS cable in the standard context.