This part of IEC 61534 specifies general requirements and tests for powertrack (PT) systems with a rated voltage not exceeding 277 V a.c. single phase@ or 480 V a.c. two or three phase 50 Hz/60 Hz with a rated current not exceeding 63 A. These systems are used for distributing electricity in household@ commercial and industrial premises. Powertrack systems@ according to this standard@ are intended for use under the following conditions: ?C an ambient temperature in the range ?C5 ??to + 40 ?? the average value over a 24 h period not exceeding 35 ?? ?C a situation not subject to a source of heat likely to raise temperatures above the limits specified above; ?C an altitude not exceeding 2000 m above sea level; ?C an atmosphere not subject to excessive pollution by smoke@ chemical fumes@ prolonged periods of high humidity or other abnormal conditions. In locations where special conditions prevail@ as in ships@ vehicles and the like and in hazardous locations@ for instance@ where explosions are liable to occur@ special constructions may be necessary. This standard does not apply to ?C cable trunking systems and cable ducting systems covered by IEC 61084 [8] 1; ?C busbar trunking systems covered by IEC 60439-2 [5]; ?C electrical supply track systems for luminaires covered by IEC 60570 [6].