Article 408 (384 in 1999 NEC)
Switchboards and Panelboards
408.21 Grounded Conductor Terminations
If two grounded (neutral) conductors are connected to the same terminal, and someone removes one of the neutrals, the other neutral may unintentionally be removed as well. If that happens to the grounded (neutral) conductor of a multiwire circuit, it could result in excessive line-to-neutral voltage for one of the circuits. For example, a 120/240V multiwire circuit, with one circuit having a 24 ohm load and the other circuit having an 12 ohm load, a loose neutral could result in as much as 160V across a 120V rated load.
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