Introductory technical guidance for electrical engineers and other professional engineers and construction managers interested in lightning protection for electronic facilities such as computer and communication equipment centers. Here is what is discussed: 1. THE PHENOMENON OF LIGHTNING, 2. DEVELOPMENT OF A LIGHTNING FLASH, 3. INFLUENCE OF STRUCTURE HEIGHT, 4. STRIKE LIKELIHOOD, 5. ATTRACTIVE AREA, 6. LIGHTNING EFFECTS, 7. BASIC PROTECTION REQUIREMENTS, 8. DETERMINING THE NEED FOR PROTECTION, 9. APPLICABLE CODES.