HP Superdome SX2000 Generic Site Preparation Guide, Fourth Edition - Page 9

Comprehensive Discussion IMPORTANT: Electrical practices and suggestions in this guide are based on North American practices. For regions and areas outside North America, local electrical codes take precedence over North American electrical codes. For example, the recommendation that the Protective Earth (PE) conductor be green with a yellow stripe, is a European Union (EU) directive. North American local electrical inspectors will accept a ground wire if the color is green with a yellow stripe. Local authority has jurisdiction (LAHJ) and should make the final decision regarding adherence to region-specific or area-specific electrical codes and guidelines. The proper design and installation of a server power distribution system requires specialized skills. Those responsible for this task must have a thorough knowledge of appropriate electrical codes and the limitations of the power systems for computer and data processing equipment. In general, a power distribution system should exceed the requirements of most electrical codes. A good design, when coupled with proper installation practices, produces the most trouble-free operation. A detailed discussion of power distribution system design and installation is beyond the scope of this guide. However, electrical factors relating to power distribution system design and installation must be considered during the site preparation process. The following electrical factors are discussed in this section: • Computer room safety • Power consumption • Electrical load requirements (circuit breaker sizing) • Power quality • Distribution hardware • System installation guidelines Computer Room Safety WARNING! The safety of personnel must be a paramount consideration when performing the following recommendations. Failure to comply can create life-threatening scenarios. Inside the computer room, fire protection and adequate lighting when servicing equipment are important safety considerations. Federal and local safety codes govern computer installations. Fire Protection The National Fire Protection Association's Standard for the Protection of Electronic Computer Data Processing Equipment, NFPA 75, contains information on safety monitoring equipment for computer rooms. Most computer rooms are equipped with the following fire protection devices: • Smoke detectors • Fire and temperature alarms • Fire extinguishing system • Air Handling (Plenum) space that is segmented from the remainder of the building Additional safety devices are: • Circuit breakers • An emergency power cutoff switch (located at the computer room exit door) • Devices specific to the geographic location (such as earthquake protection) Electrical Factors 9