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Legal Disclaimer |
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SECTION 1 - GROUNDING and BONDING SYSTEMS To ensure uniform practice in all electrical installations, Rule 10-210 lists the common electrical systems (see figure) and specifies whether the identified conductor or the identified neutral conductor that must be grounded. The term neutral is used in its strict sense, referring to one of the three conductors in a three-wire circuit that is bonded to ground and intended to carry the unbalanced load. Rule 10-210 Conductor to be grounded: |
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(1) |
For alternating-current wiring systems, the conductor to be grounded shall be as follows: |
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(a) |
single phase, 2 wire – the identified conductor; | |
| (b) | single-phase, 3 wire – the identified neutral conductor; | |
| (c) | multi-phase systems having one wire common to all phases – the identified neutral conductor; | |
| (d) | multi-phase systems having one phase grounded – the identified conductor, and | |
| (e) | multi-phase systems in which one phase is used as in item (b) – the identified conductor. |
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(2) |
in multi- phase systems in which one phase is used as a single-phase 3-wire system, only one phase shall be grounded. |
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It must be noted that neutral and bonding conductor functions are combined in a single conductor (system grounded conductor) on the line side of the service. Also neutral and bonding functions are separate on the load side of the service. |
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