| # | Letters of Interpretation |
|---|---|
| 1 | - 1910.147(c)(4)(ii) - PSM compliance for ammonia refrigeration systems. |
| 2 | - 1910.147(c)(4)(ii) - Recognition of ANSI/ASSE Z244.1 "Control of Hazardous Energy - Lockout/Tagout and Alternative Methods" consensus standard |
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