Which voltage conduit size is correct for eight 6 AWG XHHW conductors?

Which voltage conduit size is correct for eight 6 AWG XHHW conductors?

• A. 1/2"
• B. 3/4"
• C. 1"
• D. 1 1/4"

Answer: (D)

Conduit fill is what this item tests. You have to fit eight insulated 6 AWG XHHW conductors in a raceway without exceeding the code’s allowed fill, which means comparing the total cross‑sectional area of the conductors to the interior area of the conduit. Eight 6 AWG conductors each have a cross‑section of about 26,240 circular mils, so together they total roughly 210,000 cmil (about 0.21 square inches). The equipment grounding conductors, if present, are counted as a single conductor for fill purposes, so you don’t simply add another large amount for grounds; the total count is driven by the eight insulated conductors plus the single grounding conductor as one extra counted item. The conduit you choose has to provide enough interior area so that at the allowed fill percentage (often around 40% for multiple conductors) the conductors still fit with some practical pulling space. Smaller sizes like 1/2" or 3/4" commonly fall short for eight 6 AWG XHHW conductors, while 1" may be tight depending on exact counts, insulation thickness, and pulling room. The standard conduit‑fill tables show that the minimum size meeting this requirement for eight 6 AWG conductors is 1 1/4" conduit, which is why that option is correct.

Conduit fill is what this item tests. You have to fit eight insulated 6 AWG XHHW conductors in a raceway without exceeding the code’s allowed fill, which means comparing the total cross‑sectional area of the conductors to the interior area of the conduit.

Eight 6 AWG conductors each have a cross‑section of about 26,240 circular mils, so together they total roughly 210,000 cmil (about 0.21 square inches). The equipment grounding conductors, if present, are counted as a single conductor for fill purposes, so you don’t simply add another large amount for grounds; the total count is driven by the eight insulated conductors plus the single grounding conductor as one extra counted item.

The conduit you choose has to provide enough interior area so that at the allowed fill percentage (often around 40% for multiple conductors) the conductors still fit with some practical pulling space. Smaller sizes like 1/2" or 3/4" commonly fall short for eight 6 AWG XHHW conductors, while 1" may be tight depending on exact counts, insulation thickness, and pulling room. The standard conduit‑fill tables show that the minimum size meeting this requirement for eight 6 AWG conductors is 1 1/4" conduit, which is why that option is correct.