Hearing protection

Hearing protection is personal protective equipment that keeps noise from damaging the wearer's hearing. Some central inverters run with high-frequency noise that can damage hearing, so their manuals tell you to wear hearing protection when you work on them. Inverter manuals and labels mark this with a safety symbol, for example an earplug pictogram or a sign telling you to use noise protection PPE. Battery storage install procedures also list hearing protection, including in the arc-flash PPE category 3 kit. The NABCEP guide says hearing protection must be worn when 8-hour time-weighted noise exposure goes above 90 dBA. It names 85 dBA as the action level and says levels above 115 dBA need controls for any length of exposure. The options are earmuffs, disposable or reusable earplugs, and hearing bands. Every approved protector carries a Noise Reduction Rating in decibels. PPE is the last line of control, so inspect it every day and keep it clean and in reliable condition.

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• sentence 2: support check: partial - The passages say the product generates high-frequency noises that can cause hearing impairment, and they say to wear hearing protection. They don't say these are central inverters, so that detail is missing.
• sentence 4: support check: partial - Hearing protection appears in the arc-flash PPE category 3 list and in other PPE lists. The passages don't mention battery storage install procedures, so that scope is missing.
• sentence 4: review: partial - The install-procedure tables list hearing protection, including in the arc-flash category 3 kit, but the passages do not say these are battery storage procedures. -->