Choosing among half-inch conduit types means matching material to location: EMT for exposed indoor branch circuits, rigid PVC for wet or underground runs, and flexible conduit for short bends and fixture whips.
For the full breakdown, see our best 1/2 Inch Conduit guide.
All four 1/2 inch conduit types look similar on a shelf, yet carry different outside diameters, bend rules, and fill limits. Pick by where the raceway lives, not by what’s in stock.
What Are The Four Main 1/2 Inch Conduit Types?
The four options are EMT, rigid metal conduit, rigid PVC, and flexible or liquidtight flexible conduit. Each is a distinct raceway system with its own fittings, support spacing, and permitted locations.
EMT (Electrical Metallic Tubing) is the lightest rigid metal option and the default for indoor branch-circuit work. Rigid metal conduit offers the most physical protection but is heaviest and usually most expensive per foot. Rigid PVC is nonmetallic, non-conductive, and rated for indoor, outdoor, and underground use. Flexible and liquidtight flexible conduit handle short, bendy connections where alignment or movement rules out a rigid run.
These four are not interchangeable. Fill percentages, support distances, and fitting types all change with the material, and inspectors check each one separately.
EMT Versus Rigid PVC: What Decides The Outcome
Location decides it. EMT suits concealed or exposed indoor work where physical damage is limited; rigid PVC wins wherever moisture, soil contact, or corrosion is the main threat.
University of Houston master specs allow EMT concealed in furred ceilings or walls, and exposed indoors below 6′-0″ above the finished floor where it isn’t exposed to physical damage. Above that height, or outdoors, the spec points you elsewhere.
The same specs set minimum conduit size for power wiring at 1/2 inch, and permit 3/8-inch or 1/2-inch flexible metallic conduit for fixture whips. Support distance for half-inch EMT in that table is 10 ft (3 m).
Rigid PVC covers the cases EMT can’t. The cited dimensions reference describes 1/2-inch PVC as nonmetallic, non-conductive, usable indoors, outdoors, and underground, and heat-bendable — which lets you form route changes without factory elbows. PVC Schedule 40 and Schedule 80 both come in 1/2 inch, but Schedule 80 is the thicker-walled version.
Dimension And Price Differences
Half-inch trade size does not mean half-inch outside diameter.
| Conduit Type | Half-Inch Dimensions | Best For |
|---|---|---|
| EMT | 0.706 in OD / 0.622 in ID | Exposed indoor branch circuits |
| Rigid PVC, Schedule 40 | 0.840 in OD / 0.622 in ID | Wet, outdoor, and underground runs |
| PVC Schedule 80 | Same 1/2 in trade size, thicker wall | Higher-abuse PVC locations |
| Liquidtight flexible | 0.63 in ID / 0.83 in OD, 3.00 in bend radius | Short bends and vibration |
| Rigid metal | No official half-inch data in this source set | Maximum physical protection |
| Galvanized EMT, 10 ft | $6.49 each, $5.84 in bulk of 20+ | Small jobs |
| PVC gray, 100 ft roll | $1.59 per foot | Long underground pulls |
A general market guide puts material-only pricing near $0.80–$2.50 per foot for EMT, $0.90–$2.50 for PVC, and $1.20–$3.00 for flexible — planning estimates, not manufacturer price sheets. If you’d rather skip the aisle-by-aisle research, this comparison of the best 1/2 inch conduit options covers tested picks side by side.
The University of Houston master specs govern conductor fill and permitted exposures. UH’s electrical raceways master specification sets the minimum power-wiring conduit size and the fixture-whip allowances quoted above.
Where Flexible And Liquidtight Fit
Flexible conduit is for short, bend-sensitive sections, not long trunking.
Flexible metallic conduit in 3/8 or 1/2 inch is allowed for fixture whips under the UH specs. Anything longer should run in EMT or PVC instead, because flexible raceway sags, costs more per foot, and offers weaker physical protection.
Final Pick By Location
- Indoor, exposed, below the damage threshold, dry space: EMT.
- Wet, outdoor, buried, or corrosion-heavy: rigid PVC.
- Higher-abuse PVC location: PVC Schedule 80.
- Short connection with a tight bend or vibration: liquidtight flexible.
- Maximum physical protection, budget secondary: rigid metal conduit.
The authority having jurisdiction has the final word on permitted exposure and fill. Check fittings before you buy — half-inch EMT, half-inch PVC, and half-inch flexible each take their own connectors, bodies, and straps.
FAQs
Do half-inch EMT and half-inch PVC use the same straps and connectors?
Plan on separate fittings for each material.
Can rigid PVC conduit be bent without elbows?
Yes. Half-inch PVC is heat-bendable, so route changes can be formed in place instead of cut and joined with factory elbows. The bend still has to stay within the radius your inspector accepts and must not kink or flatten the tube.
Is liquidtight flexible conduit the same as “rigid” conduit?
Rigid metal conduit is the heaviest, most protective option and does not flex, so the two serve completely different parts of a run.
References & Sources
- University of Houston Facilities Planning & Construction. “Electrical Raceways Master Specification 26 05 33.” Supports minimum conduit size, EMT exposure limits, fixture-whip allowances, and support distance.
- University of Houston Facilities Services. “Electrical Raceways Master Specification 26 05 33.” Companion copy of the same raceway criteria.
- Hubbell. “Kellems Liquidtight Flexible Conduit Spec Sheet.” Source for half-inch liquidtight dimensions, bend radius, and material.
