🔍 Key Concepts

• 46 CFR Part 58 – especially subpart covering refrigeration machinery • Difference between control devices (like cut-outs) and safety/relief devices • What is meant by “for protection purposes” in machinery spaces

💭 Think About

• Look at which option is a fundamental safety requirement that must be fitted on all pressure-containing systems, not just on specific types of refrigeration plants. • Ask yourself: which device is intended to prevent dangerous overpressure regardless of the control system’s status? • Consider which items may be required only on certain types or sizes of systems versus which is a universal requirement on all refrigeration systems for protection.

✅ Before You Answer

• Verify in 46 CFR Part 58 which item is explicitly stated as required on all refrigeration systems for protection. • Distinguish between devices that control normal operation (cycling the compressor) versus devices that protect against equipment failure or abnormal pressure. • Confirm whether the regulation language says “each system shall be fitted with…” or similar mandatory wording for the chosen device.