Which PE Electrical exam should you take?

If you're an electrical engineer approaching the PE, the first thing to know is that there isn't one PE Electrical exam. There are three, and you sit exactly one of them.

NCEES administers PE Electrical and Computer as three separate exams: Power, Electronics, Controls, and Communications (usually shortened to ECC), and Computer Engineering. They share a discipline name and almost nothing else — different specifications, different reference material, and, as you'll see below, wildly different candidate populations.

The three exams, by the numbers

Figures are NCEES's own, from its 2024 Squared report (2023–24 testing year).

	Candidates	First-time pass	Repeat pass
Power	3,270	60%	42%
Electronics, Controls & Communications	293	71%	46%
Computer Engineering	41	46%	—

The distribution is the first thing worth absorbing: Power is roughly eleven times the size of ECC and eighty times the size of Computer Engineering. Nine out of ten electrical PE candidates sit Power.

Two cautions on reading that table. The Computer Engineering pass rate rests on 39 first-time examinees, which is far too small a group to tell you anything about your own chances. And pass rates across different exams aren't a difficulty ranking — different exams attract differently prepared populations, and a higher rate can reflect a more specialised, better-matched candidate pool rather than an easier test.

Scheduling is a real constraint, not a footnote

Power is offered every quarter. ECC and Computer Engineering are offered far less often — Computer Engineering runs on a single day per year, a direct consequence of how few people sit it.

This matters more than it first appears. A quarterly exam means you sit when your preparation is ready, and if it goes badly you can regroup in months rather than years. An annual exam means a bad day costs you twelve months, and your entire study plan has to aim at one fixed date.

The honest answer: sit the one that matches your work

The exam to take is the one whose content overlaps your day-to-day engineering. That sounds obvious, and it's still the advice most often given by people who've passed — because the alternative is spending months learning a subject area you don't practise.

• Power covers power-system work: circuit analysis, protection and relaying, rotating machines, transformers and power devices, transmission and distribution, electrical safety and codes, measurement and instrumentation. If your work touches building electrical design, utilities, substations, industrial power, or renewables, this is almost certainly your exam.
• ECC covers electronics, control systems, and communications.
• Computer Engineering covers computer hardware and systems.

If you're genuinely between two, the tiebreakers in order: which one your daily work covers more of, which one you can schedule when you'll be ready, and which one you can actually find good material for. That last one isn't a cop-out — it's a real constraint, and we'll come back to it.

Does the choice restrict what you can do later?

For most engineers in most states, the licence you earn is a PE licence — not a discipline-restricted one — and which exam you passed doesn't formally limit what you can seal.

But this varies by state, and the exceptions are real. Some states do tie sealing authority to the branch you were examined in. This is a question with a definite answer for your jurisdiction, and the only reliable source is your own licensing board. Ask them before you let "it doesn't matter" drive the decision.

What doesn't vary is the professional expectation: your licence obliges you to practise only within your competence, whatever your certificate permits. Passing an exam in a field you don't work in doesn't make you qualified to practise it.

The material-availability problem

There's a factor nobody puts in an official guide, and candidates raise it constantly: there is far more preparation material for Power than for the other two. Courses, practice exams, study guides, and communities all cluster where the candidates are, and the candidates are overwhelmingly in Power.

Candidates who've sat ECC describe the shortage plainly — limited material, some of it built for the older pencil-and-paper format. Some engineers whose work sits between fields choose Power partly because they can actually get prepared for it.

We'd rather say this than pretend it isn't a factor. If two exams fit your work about equally, the one you can prepare properly for is the better exam to sit. If only one fits your work, though, material scarcity is a problem to solve, not a reason to sit the wrong exam.

How to decide, in order

1. Which exam's specification overlaps your actual work? Read the published NCEES specification for each one you're considering — not a summary, the specification itself. If one is obviously closer, you're done.
2. Check your state board on whether the branch you're examined in affects sealing authority.
3. Look at the calendar. Can you be ready for the next available sitting of each?
4. Check what you'd study from, honestly, before you commit.

Most electrical candidates work through that list and arrive at Power. If you arrive somewhere else, that's the list working correctly.

Where CastorPrep fits

We build exam-real practice and a grounded AI tutor for NCEES PE exams. PE Electrical: Power is in build now — if you're sitting Power, you can get an email when it opens.

We don't currently cover ECC or Computer Engineering, and given how few engineers sit them, we're not going to pretend otherwise.

First attempt or your next one — the first decision is which exam. Get that one right and the rest of the plan follows.