How many 500 kcmil wires fit in 1/2 inch EMT?

None — this size does not fit 1/2 inch EMT; step up a trade size.

How many 500 kcmil wires fit in 3/4 inch EMT?

0 conductors, using a nominal THHN outside diameter of 0.949 in and the 40% fill rule for three or more conductors.

Do neutrals and grounds count toward fill?

Yes, every conductor in the raceway counts for fill. Grounds are excluded only from the count of current-carrying conductors used for ampacity adjustment.

What is the cross-sectional area of 500 kcmil THHN?

About 0.7073 square inches, from A = π × (OD / 2)² with a nominal insulated OD of 0.949 in.

500 kcmil Conduit Fill by Conduit Size

How many 500 kcmil THHN conductors fit in EMT, IMC, RMC and PVC conduit, 1/2 inch through 4 inch, with the 40% fill rule applied.

Quick answer

No 500 kcmil THHN conductors fit in 1/2 inch EMT and 0 fit in 3/4 inch EMT, at 40% fill for three or more conductors. Each conductor consumes 0.7073 sq in from a nominal insulated outside diameter of 0.949 in. Neutrals and grounds count.

500 kcmil conductors per conduit trade size

Same-size conductors only, at 53% for one, 31% for two and 40% for three or more.

Conduit	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	3-1/2"	4"
EMT	—	—	—	1	1	1	3	5	6	8
IMC	—	—	—	1	1	1	2	4	5	7
RMC	—	—	—	1	1	1	2	4	5	7
PVC Sch 40	—	—	—	1	1	1	2	4	5	7
PVC Sch 80	—	—	—	—	1	1	1	3	4	6

Published standard

Source & method: Counts are the largest whole number where n × conductor area stays inside the raceway area times the applicable fill percentage. Mix conductor sizes in the calculator.

Fill behaviour at 500 kcmil: the top of routine conduit work

500 kcmil is the largest conductor commonly pulled as a single conductor per phase in ordinary construction, and its raceway counts show why: a complete set consumes most of a 4 inch tube. Above this size, parallel sets in multiple raceways are almost always the better installation.

Weight and pulling tension are the practical limits. Vertical risers need conductor support at intervals, horizontal runs need pull boxes, and every bend has to respect a large radius. Fill margin above the minimum count is not a luxury at this size, it is what makes the pull possible.

Source & method: Counts referenced above come from the computed table on this page — how these numbers are derived.

What each raceway type means

EMT — EMT (electrical metallic tubing)
IMC — IMC (intermediate metal conduit)
RMC — RMC (rigid metal conduit)
PVC Sch 40 — PVC Schedule 40
PVC Sch 80 — PVC Schedule 80

Full fill charts by raceway

Per-type counts for every trade size, plus the cross-type comparison and reverse lookup.

Frequently asked

How many 500 kcmil wires fit in 1/2 inch EMT?: None — this size does not fit 1/2 inch EMT; step up a trade size.
How many 500 kcmil wires fit in 3/4 inch EMT?: 0 conductors, using a nominal THHN outside diameter of 0.949 in and the 40% fill rule for three or more conductors.
Do neutrals and grounds count toward fill?: Yes, every conductor in the raceway counts for fill. Grounds are excluded only from the count of current-carrying conductors used for ampacity adjustment.
What is the cross-sectional area of 500 kcmil THHN?: About 0.7073 square inches, from A = π × (OD / 2)² with a nominal insulated OD of 0.949 in.

Conduit fill for nearby sizes

Same 40% fill rule applied to the sizes either side of this one, wrapping around the range so every size is reachable.