HP A4500A Hardware Manual - rp24xx, Customer Viewable - Page 47

Electrical Interference Safety Standards Electrical Interference Safety Standards The following are some of the sources of electrical interference that may affect rp24xx servers. Convenience Wall Outlets Power outlets for building maintenance equipment (i.e., vacuum cleaners, floor buffers, etc.) must be wired from circuit breakers on a power panel separate from the computer system panel. The ground wires from these outlets must be connected to the normal building distribution panel; not the computer system ground. If a separate power source and separate ground are not provided, operation of janitorial equipment can induce electrical noise and cause abnormal operation of the computer system. Your electrician can verify whether or not maintenance outlets are on separate panels. Lightning In some geographical areas it may by advisable to install lightning protection for both personnel and computer systems. In the United States (USA), the installation of lightning or surge arrestors on power and communication lines is described in the National Electrical Code, Article 280. All lightning arrestors must have the UL 1449 rating and should be tested to survive the suite of IEEE587 tests. The principles of lightning protection and personnel safety are outlined in detail in the lightning protection code contained in the National Fire Protection Association (NFPA) Handbook. Chapter 55