Rigid Metal or PVC Through the Roof? NEC Article 230 Overhead Service Drops Explained

What Exactly Is a Service Drop?

Before you can decide between rigid metal and PVC, you have to know what you’re actually working on. As the Electrical Code Coach explains in this Article 230 walkthrough, a service drop is the overhead conductors between the serving utility and the service point — simply put, the wires running from the pole to your structure.

The catch is the term service point. The NEC defines it as the point of connection between the facilities of the serving utility and the premises wiring. But here’s the important part:

“Our utility companies actually dictate where the point of service is… They can say here at the transformer… they could say that it’s over here on this swag pole… More often than not, it’s usually at the top of that weather head at the top of the service riser. But there’s nothing stopping them from saying that it’s down in the meter socket itself.”

This matters because the service point is where the NEC kicks in — and usually where your financial responsibility as the owner begins for repair or replacement.

Why the NEC Doesn’t Even Cover the Service Drop

This is where things get counter-intuitive. If you flip back to the front of the code book, you’ll find that the NEC doesn’t technically cover the service drop at all.

• 90.2(A) tells us the NEC exists for the practical safeguarding of people and property from electrical hazards. It is explicitly not a design manual and not written for the untrained person.
• 90.2(B) reinforces that NEC installations aren’t always efficient, convenient, or suitable for future expansion — those are field considerations, not code requirements.
• 90.2(C) lists what the code does cover: public and private structures, yards, lots, parking lots, carnivals, industrial-owned substations, mobile homes, floating buildings, and more.
• 90.2(D) lists what it doesn’t cover: utility generation, distribution, energy storage, and utility metering.

And the section that settles the question for service drops specifically is 90.2(D)(5)(a), which excludes installations “consisting of service drops, service laterals, and associated metering.”

So if the NEC doesn’t cover the drop, why does your inspector care about the height of the service? Because the rules governing the point of attachment on your structure are still very much in the code — and they indirectly dictate how that drop has to behave.

Rigid Metal or PVC? The Point of Attachment Decides

The answer to the big question starts at 230.26, which governs the minimum height of the point of attachment:

“The point of attachment of overhead service conductors to a building or other structure shall provide the minimum clearances as specified in 230.9 and 230.24. In no case shall it be less than 10 ft above finished grade.”

The point of attachment is simply the first place the overhead conductors attach to the structure. How you build it depends entirely on whether the conductors will rise or droop after that point.

Scenario one — conductors rise, PVC stays below the roof. Imagine a 14 ft eave with your 10 ft mark below it. If the wire travels upward to the utility and you can satisfy every clearance, you can use a simple through-bolt — drilled through the fascia with a washer and nut on the back side — to give the utility something to attach to. In this case you’re allowed to run PVC under the eave, saving a roof penetration plus the cost of rigid metal and all its fittings.

Scenario two — conductors droop, rigid metal through the roof. Same 14 ft eave, but now the wire droops down after the point of attachment and won’t meet the minimum heights. Here you must go through the roof and place the point of attachment on the pipe itself, using a fitting that wraps the pipe to give the utility a hook point. That pipe cannot be PVC — it has to be rigid metal conduit or another approved means.

The rule of thumb:

1. If you can meet all your height requirements, keep PVC below the roofline and never penetrate it.
2. If you can’t meet them after the point of attachment, go through the roof and raise the service higher with rigid metal.

The Clearances in 230.9

Section 230.26 sends you to 230.9, which sets clearances around openings and surfaces in parts A, B, and C:

• 230.9(A) — Open service conductors must keep at least 3 ft of clearance from windows designed to open, doors, porches, balconies, ladders, stairs, fire escapes, and similar locations.
• 230.9(B) — The vertical clearance above (or within 3 ft measured horizontally of) platforms, projections, or surfaces that permit personal contact must be maintained per 230.24. In other words, for 3 ft out from any such surface, the full drop heights apply.
• 230.9(C) — Overhead service conductors must not be installed beneath openings through which materials are moved (think farm and commercial buildings), and must not obstruct building entrances.

The Minimum Heights in 230.24(B)

This is the heart of the matter. For overhead service conductors not exceeding 1,000 volts, 230.24(B) gives four common heights — all measured above final grade (so if grade isn’t set yet, plan ahead):

1. 10 ft — sidewalks and areas accessible only to pedestrians, where the voltage to ground does not exceed 150V. This covers 120/240 and 120/208 systems, but not 277/480.
2. 12 ft — residential property and driveways, plus commercial areas not subject to truck traffic, where voltage to ground does not exceed 300V. This now includes 277/480 because the limit is line-to-ground.
3. 15 ft — the same areas as item 2, but where the voltage does exceed 300V to ground.
4. 18 ft — public streets, alleys, roads, and parking areas subject to truck traffic; driveways on non-residential property; and over agricultural land such as cultivated, grazing, and forestry areas.

And one to keep in your back pocket: if the conductors cross a railroad, the clearance jumps to 24 ft.

Remember, the voltage trigger is always line-to-ground (or phase-to-ground) on any single conductor — not phase-to-phase. That distinction is what determines whether you land in the 150V or 300V bucket.

Why It All Comes Together

Even though the NEC doesn’t technically cover the service drop, the codes are woven together to keep everything in harmony — and the reasoning is refreshingly practical:

“If you’re an installer, you want to make sure that you’re doing installs that don’t have callbacks. If you’re the homeowner, you want to make sure that you’re ending up with a long-lasting installation. And if you’re the inspector, you want to make sure that you don’t… have a service ripped off the house a few weeks after you approve it just because it didn’t meet those minimum heights after finish grade.”

Get the point of attachment right, respect the clearances in 230.9, hit the heights in 230.24, and the choice between PVC and rigid metal makes itself.

How NEC Mastery Fits Into This

Article 230 is exactly the kind of topic that trips electricians up on exam day — not because the rules are hard, but because they cross-reference each other (230.26 sends you to 230.9 and 230.24) and hinge on details like line-to-ground voltage. That’s where repetition and structure-building pay off.

• 8,000+ exam-style questions give you the reps to drill service-entrance scenarios until clearances and heights become second nature — no more second-guessing whether a 277/480 service needs 12 ft or 15 ft.
• Detailed explanations referencing specific NEC articles reinforce why an answer lands in 230.24(B)(2) versus (B)(4), building the mental map of Article 230 you need to navigate it quickly.
• Timed mock exams weighted to your exam type let you practise finding service-drop answers under pressure, so when a clearance question shows up on the real test, your hands already know where to turn.

Pair NEC Mastery with your code book, and rules like the rigid-metal-versus-PVC decision stop being something you memorise and start being something you simply understand.