With no state license governing industrial maintenance work, the trade runs on a different kind of credential: safety certifications that employers treat as close to mandatory even though no government board issues a license requiring them. Three matter most.
OSHA 10 and OSHA 30
General industry safety training through OSHA's outreach training program — 10-hour and 30-hour courses covering workplace hazard recognition, PPE, and general safety fundamentals. OSHA 10 is often the baseline expectation for any entry-level plant hire; OSHA 30 (more in-depth) is increasingly expected for leads and supervisors. Neither is a government mandate for every worker by default, but individual employers and even some state/local regulations may require it for specific work, and most serious industrial employers treat it as a standard hiring prerequisite regardless.
NFPA 70E: Electrical Safety in the Workplace
As modern maintenance work increasingly involves electrical diagnostics and repair alongside mechanical work, NFPA 70E — the National Fire Protection Association's standard for electrical safety in the workplace — has become a critical credential. It covers arc-flash hazard analysis, proper PPE selection for electrical work, and safe work practices around energized equipment. Given the trade's growing overlap with electrical and controls work (the automation/PLC connection), this credential matters more every year, not less.
Lockout-Tagout (LOTO): The One That's Genuinely Life-or-Death
This is the credential to take most seriously. Lockout-tagout, formalized under OSHA 29 CFR 1910.147, is the procedure that ensures machinery is fully de-energized and cannot unexpectedly restart while someone is servicing it. Failure to follow LOTO procedure correctly is one of the leading causes of serious injury and death in industrial maintenance work — caught limbs, electrical shock, crushing injuries from equipment that re-energizes mid-repair.
Every other certification in this trade makes you more employable. LOTO discipline, done correctly every single time without exception, is what determines whether you go home at the end of the shift.
How These Function Without a License Behind Them
Since no state board enforces a license for this trade, these certifications collectively do the trust-building work a license would otherwise perform: they signal to an employer that a candidate takes safety seriously, understands the regulatory framework they're operating in, and has demonstrated baseline competency in the areas most likely to cause serious harm if handled casually. A resume listing OSHA 30, NFPA 70E, and LOTO certification tells a hiring manager something concrete that "several years of maintenance experience" alone doesn't.
Beyond the Core Three
- Manufacturer-specific training (Allen-Bradley/RSLogix and similar PLC platforms) — increasingly valuable as plants automate.
- Rigging and crane-signal certifications — relevant for millwright-heavy work involving heavy equipment moves.
- Welding certifications — useful given how often fabrication and repair welding shows up in the job (covered in the millwright job description).
The Practical Takeaway
Prioritize LOTO and general OSHA safety training first — they're foundational and expected almost everywhere. Add NFPA 70E as electrical work becomes a bigger part of your role. Layer in manufacturer/PLC training deliberately if pursuing the trade's higher-paying automation-adjacent specializations.