A minimum working space depth of 3 feet to live parts operating at 277 volts-to-ground is required where there are exposed live parts on one side and no live or grounded parts on the other side.
This is further explained below.
Generally, the depth of anything is measured from its top or surface all the way down to its core.
In conclusion, Where there are exposed live components on one side and no live or grounded parts on the other side, there must be a minimum working space depth of 3 feet to live parts running at 277 volts-to-ground. This requirement must be adhered to at all times.
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