A confined space is not one electrical environment. A dry equipment space, a wet steel vessel and an area with flammable gas present different selection problems. Start with the entry assessment and the applicable work rules, then choose the complete lighting arrangement.
Separate atmospheric hazards from electric-shock hazards
A permit-required entry program addresses atmospheric testing, entry conditions and other hazards. Lighting approval addresses whether the equipment is suitable for the classified location. Lowering the supply voltage does not remove an explosive atmosphere or make a lamp intrinsically safe.
Read the voltage rule in context
For construction portable lighting in wet or other conductive locations, OSHA 1926.405(a)(2)(ii)(G) specifies 12V or less and permits a stated 120V alternative with GFCI protection. It does not set a general 24V confined-space allowance. Other work contexts, owner rules and equipment instructions must be checked separately.
Identify both sides of a transformer
A transformer can receive a higher supply voltage while feeding a lower-voltage lamp. State the input, output and AC/DC requirements separately. Verify transformer inclusion, location, cord lengths, connections and approval scope for every component. Do not treat the lamp head's rating as a rating for the whole arrangement.
Position the light for the repair and retrieval
Use permitted hooks or supports to avoid blocking the access opening. Place the light where the worker can see around equipment while keeping cables away from sharp edges and trip routes. A personal light can complement a separately aimed task lamp, but neither establishes a complete entry or rescue plan.
Compare hand-lamp configurations by the actual supply and lamp-side arrangement before selecting cord length or other options.
References: OSHA 1926.405 — Temporary wiring and portable lighting · OSHA 1910.146 — Permit-required confined spaces · OSHA 1910.307 — Hazardous (classified) locations