Ace Your NCCER Level 4 Exam 2026 – Elevate Your Skills and Conquer Construction!

The main idea here is that the installer’s assessment covers multiple areas, not just one. The best description is that all four categories are tested, meaning you’re evaluated on Categories 1, 2, 3, and 4. If you limited the test to only some categories, you’d miss evidence of competence in the others, which isn’t how the NCCER Level 4 installer assessment is designed. The other options either leave out a category or mislabel the categories, so only listing all four categories accurately reflects the full scope of what the installer is expected to know and demonstrate.