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| Notice: |
| NEC is a registered
trademark of the National Fire Protection Association, Inc. All NEC references by Electrical Helper are interpretations of the NEC by the Electrical Helper staff and are not NEC statements. The official position of the NEC requires that the NEC be referred to in its entirety. |
| On a 4 wire delta connected NEC Article 110.15 requires the higher voltage conductor to be permanently marked with a durably and permanently orange outer finish. |
| NEC Table 110.26 | |||
| Nominal Voltage to Ground | Minimum Clear Distance | ||
| Condition 1 | Condition 1 | Condition 1 | |
| 0 - 150 | 900mm (3 ft) | 900mm (3 ft) | 900mm (3 ft) |
| 151 - 600 | 900mm (3 ft) | 1.1m (3-1/2 ft) |
1.2m (4 ft) |
| Condition 1 Exposed live parts on one side of the working space and no live or grounded parts on the other side of the working space, or exposed live parts on both sides of the working space that are effectively guarded by insulating materials. | |||
| Condition 2 Exposed live parts on one side of the working space and grounded parts on the other side of the working space. Concrete, brick, or tile walls shall be considered as grounded. | |||
| Condition 3 Exposed live parts on both sides of the working space. | |||
| Article 430-110 | |||
| States that the disconnecting means for motor circuits rated at 600 volts or less shall have an ampere rating not less than 115 percent of the full-load current rating of the motor. Unless it is non-fusible rated for the horsepower being served. | |||
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