NEBS Level 3 Certification involves the test suite listed below. Several of the tests, including Fire, Lightning Immunity and Earthquake, often destroy equipment being tested.
System Fire Test and Fire Test on Material/Components – Tests fire spread, heat flux, rate of heat release and fire resistance of materials, components, cable and wire. Test is always destructive to the equipment.
Electrical Safety – This requirement is intended to protect people by limiting the voltages and currents applied to communications circuits and energized parts of the network equipment.
Luminosity Requirements – This ensures that all visual indications and front panel markings can be easily seen and correctly interpreted under a variety of good and poor lighting conditions.
Listing Requirements – Requires the equipment is registered with a nationally recognized testing lab.
Bonding and Grounding – Address multi-point grounding, AC and DC grounding, types of connectors and short circuit fault currents.
EMI Emissions – Checks for radiated electrical and magnetic fields emission for Class A and Class B digital devices and conducted emission for AC and DC power and signal leads.
Short Circuit Protection – Ensures the equipment will not be damaged, require manual intervention, or become a fire, fragmentation (explosion) or electrical safety hazard as a result of a short circuit.
Lightning Immunity – This requires the equipment will not be or become a fire, fragmentation (explosion) or electrical safety hazard as a result of first or second level lightning surge.
Current Limiting Protection – Stipulates that equipment exceeding the allowable time current criteria shall be provided with current limit protectors.
AC Power Fault Immunity – This establishes the equipment will not be or become a fire, fragmentation (explosion) or electrical safety hazard as a result of the application of first level or second level AC power fault.
Voltage Limiting Protection – The equipment manufacturer must indicate in the documentation any special voltage protection required by the equipment.
Operational Thermal Operating Conditions – This ensures the equipment operates without service interruption in the temperature range of -5 degrees C to 50 degrees C and a relative humidity range of 5% to 90%.
Earthquake Zone 4 Protection – This is the highest severity level required for the continental U.S.. Zone 2, a NEBS Level 2 requirement, is 40% of the intensity level of Zone 4 requirement.
Office Vibration – This ensures the equipment operates without service interruption while being subjected to low-level vibrations in the 5 to 100 Hz range.
Airborne Contaminants – Indoor and outdoor level testing. The equipment must resist damage from pollutants found in the atmosphere. This includes mixed flowing gas and hygroscopic dust.
ESD Normal Operation and Installation and Repair – The equipment must operate properly when subjected to ESD levels (static electricity) that may be found in a network facility.
EMI Emission – Requirement limits the equipment’s radiated electrical and magnetic field emissions, and conducted emissions on power and signal leads and when cabinet doors or panels are opened or removed.
EMI Immunity – The equipment must operate properly when subjected to radiated electrical fields and conducted RF signals on the AC and DC power leads and to withstand radiated electric fields of 10 V/m with and without doors or panels.
Steady State Power Induction Requirements – Tests proper signaling and supervisory functioning when the equipment is subjected to power inductions from the loop and trunk plant.
Storage Environments, Transport and Handling – This addresses the damage that may take place in storage and transport.
Corrosion Resistance – Tests for resistance to airborne and surface contaminants.
GR-3108 Class 2 – Hardened requirement for protected, uncontrolled environments (indoor protected from rain and sun, not temperature controlled). Corrosion Resistance levels increases and wider temperature range of -40°C to +65°C.
GR-3108 Class 4, GR-487 – Hardened requirement for unprotected, uncontrolled environments (outdoor exposed to weather). Corrosion Resistance levels increases, wind driven rain requirement and temperature range increases -40°C to +46°C with Solar Load.