..... in multiwire branch circuits, the removal of a wiring device, such as
a receptacle, may not interrupt the continuity of the grounded (neutral)
conductor [300.13(B)]. Therefore, the grounded (neutral) conductors must be
spliced together and a pigtail must be provided for device terminations. The
opening of the ungrounded (hot) or grounded (neutral) conductor of a
two-wire circuit during the replacement of a device doesn't cause a safety
hazard, so pigtailing these conductors isn't required by the NEC.
(from http://www.ecmweb.com/ar/electric_code_qa_12 /)
In general, pigrtailing the neutral is considered best practice.
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