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To determine the number of strain supports required for a 350 ft raceway, it is important to understand the guidelines set by the National Electrical Code (NEC) and the standards for raceway installations. Typically, the NEC specifies that for raceways that are 10 feet or longer, support must be provided at intervals not exceeding 10 feet.

Given that the raceway in question is 350 feet long, you can calculate the number of supports needed by dividing the total length of the raceway by the maximum spacing for supports. For a 350 ft raceway, if you provide a support at the beginning and continue to place supports every 10 feet or so, this will give you the total number of required supports.

When you calculate this, you would find that you need a support at each 10-foot increment along the entire length of the raceway. Hence, a total of 35 supports would be necessary, and with one initial support at the start, you would be needing additional supports after every 10 feet.

None of the choices provided reflect this calculation directly, indicating an oversight in interpreting the context of the options. Therefore, the number of strain supports should correspond to the requirement of having consistent support to adequately secure the