Final answer:
The ampacity of a single #3/0 THW copper conductor is typically 200 amperes at 75°C. For six conductors in parallel, the total ampacity is the sum of individual conductors, with actual ampacity potentially impacted by various factors including ambient temperature and installation conditions.
Step-by-step explanation:
The question relates to the ampacity of conductors in an electrical system, specifically six #3/0 THW copper conductors in parallel in a single raceway for a 240/120 volt single-phase service. This falls under the area of electrical engineering
In order to answer this question, one would typically reference the National Electrical Code (NEC), specifically the tables that provide ampacity ratings for different sizes and types of conductors under various conditions. However, without the NEC tables or additional context such as the ambient temperature and the exact installation conditions, a precise ampacity cannot be given as these factors can affect the ampacity rating. Normally, the ampacity of a #3/0 THW copper conductor at 75°C is 200 amperes if not adjusted for ambient temperature or other de-rating factors. With six conductors in parallel, the total ampacity would be the sum of the individual conductors' ampacities, assuming all other conditions are met that allow for conductors to be run in parallel.
Therefore, it is essential that any calculation of ampacity is conducted with reference to the latest NEC code and any local amendments that may apply to the installation.