UL 508A
Main coverage risks and testing items
1. Insulation & dielectric test
2. Bonding continuity test
3. Temperature rise test (critical)
4. SCCR verification (mandatory)
5. Clearance & creepage distance
6. Overcurrent/short-circuit protection review
7. Mechanical structure test
8. Flame retardancy & material test
9. Wiring & component review
10. Marking & documentation review
UL 508
Main coverage risks and testing items:
1. Insulation & dielectric test
2. Temperature rise test
3. Bonding continuity test
4. Overload & short-circuit test
5. Clearance & creepage distance
6. Mechanical life test
7. Flame retardancy & material test
8. Leakage current test
9. Terminal & wiring review
10.Marking & documentation review
NFPA 791
Main coverage risks and testing items:
1. Documentation & design review
2. Insulation & dielectric test
3. Bonding continuity & impedance test
4. Temperature rise test
5. Short-circuit & overload protection review
6. Clearance & creepage distance review
7. Leakage current test
8. Mechanical & environmental review
9.Marking & warning review
10.Sampling & batch evaluation
NFPA 79
Main coverage risks and testing items:
1. Emergency stop (mandatory)
2. Safety interlocks (mandatory)
3,.Grounding (mandatory)
4. Insulation & dielectric
5. Clearance & creepage
6. SCCR & short-circuit protection
7. Wiring practices
8. Temperature rise & materials
9. EMC & surge protection
10. Marking & documentation
NFPA 70
Main coverage risks and testing items:
1. Insulation & dielectric test
2. Grounding & bonding test
3. Temperature rise test
4. Overcurrent/short-circuit protection review
5. Clearance & creepage distance
6. Leakage current test
7. Flame retardancy & material test
8. Mechanical & environmental test
9. Marking & documentation review
