1. Underwriters Laboratory Standard for Safety UL746B (1989).
2. Underwriters Laboratory Standard for Safety UL508, Industrial Control Equipment (1986).
3. Underwriters Laboratory Standard for Safety UL45, Portable Electric Tools (1989).
4. Underwriters Laboratory Standard for Safety UL484, Room Air Conditioners (1988).
5. Underwriters Laboratory Standard for Safety UL 514 (1989).