EEI CAST vs the IBEW Aptitude Test

They are not the same test, they are not written by the same people, and preparing for one does not prepare you for the other. The CAST is an Edison Electric Institute battery of four timed tests that utilities use when hiring into skilled trades directly. The IBEW apprenticeship aptitude test is a two-section test built for the Electrical Training Alliance by the American Institutes for Research, used by joint apprenticeship committees selecting apprentices. Which one you sit depends on who you applied to.

Side by side

	EEI CAST / CAST-R	Electrical Training Alliance aptitude test
Published by	Edison Electric Institute	Electrical Training Alliance
Developed by	Personnel Designs, with a 34-company consortium	American Institutes for Research, working with the Alliance since 1992
Sections	Graphic Arithmetic, Mechanical Concepts, Reading for Comprehension, plus Mathematical Usage (CAST) or the Work Preferences Inventory (CAST-R)	Two: algebra and functions, and reading comprehension
Length	110 questions in 87 minutes (CAST); 197 items in 110 minutes (CAST-R)	About two hours; per-section counts and limits are not published
Reported as	An index score from 1 to 10	A numeric result, with each committee setting its own requirement
Used by	Utilities in EEI's testing consortium, hiring directly	Joint apprenticeship and training committees, selecting apprentices

The differences that matter for preparation

There is no mechanical test on the Alliance test. This is the biggest practical gap. Mechanical Concepts is 44 of the CAST's 110 questions and the section most candidates find hardest, and it simply does not appear in the apprenticeship aptitude test. Someone who has spent three weeks on gears and pulleys for the wrong test has spent three weeks on nothing.

The math is different in kind. The Alliance test names algebra and functions as a section, which means manipulating expressions and working with relationships. The CAST's Mathematical Usage test is a speed test of arithmetic and formula application — 18 questions in 7 minutes — and the CAST's other numerical section, Graphic Arithmetic, is arithmetic applied to drawings. Algebra practice helps with one and is largely beside the point for the other.

Only one of them has a drawings section. Graphic Arithmetic is a CAST section with no counterpart in the Alliance test.

Reading is the common ground. Both include reading comprehension, and the underlying skill — locating a fact in dense text and applying it exactly as written — is the same. Practice there transfers. Our Reading demo is useful whichever test you face.

The rules around the test differ too

The apprenticeship committees tend to be more open about their process than utilities are. Individual committees publish their own requirements — Ithaca's, for example, states a minimum result needed to progress to an oral interview, together with a two-year validity period and a six-month wait before a retake. That is more than any utility publishes about an EEI battery: no employer discloses the level it hires at, and EEI's CAST brochure says cutoffs are tailored to each company's needs.

Note also that the committee requirement is local. One committee's published figure tells you nothing about another's, which is the same trap as with the EEI batteries, just with more visible numbers to misapply.

Which one applies to you

• You applied to an electric utility for an apprentice, pre-apprentice or skilled trades job. Expect an EEI battery — usually CAST or CAST-R. Some utilities have moved parts of this to other assessments, so confirm.
• You applied to a joint apprenticeship and training committee. Expect the Alliance aptitude test.
• You are doing both, which many people sensibly are. Then you need reading for both, algebra for one and mechanical reasoning plus drawings for the other. Do not assume a single study guide covers it.

The Electrical Training Alliance publishes its own preparation page with example questions; use it for that route. For the utility route, the EEI brochures are the primary source for what is on the battery, and our CAST practice runs it at the documented lengths.

Why the confusion is so common

Because both routes lead to line work, and because the internet flattens them. Search for lineman aptitude test preparation and you will get results about both, often on the same page, sometimes describing one and naming the other. Add that utilities and committees both hire apprentices, that both tests are about two hours, and that both are usually the first real filter, and the conflation is understandable.

The fix is a single question to whoever invited you: what is the test called? If the answer includes CAST, POSS, MASS, TECH or SO/PD, it is an EEI battery. If it mentions an apprenticeship committee or the Electrical Training Alliance, it is the other one. Our overview of the EEI batteries covers the first case; access covers every EEI section this site builds.

Frequently asked questions

Is the CAST test the same as the IBEW aptitude test?

No. Different publisher, different author, different sections. The CAST has four tests including mechanical reasoning and a drawings section; the apprenticeship aptitude test has two, algebra and reading.

Does the IBEW test have mechanical questions?

The Electrical Training Alliance describes its test as a math section and a reading comprehension section. Mechanical reasoning is a feature of the EEI batteries, not of that test.

Can one result be used for both?

No. They are separate instruments run by separate organizations for separate selection processes.

Which is harder?

They are hard in different ways. The CAST is a speed test — 44 mechanical questions in 20 minutes, 18 math questions in 7 — while the Alliance test runs about two hours across two sections and leans on algebra. Your background decides which suits you.