NEC 2005 Handbook page 191

[Danny Phillip Doeden]

It is talking about the difference between a separately derived system and a non separately derived system. Please correct me if I am wrong, it looks like the grounded conductor (neutral) is not switched at the transfer switch in a non serarately derived system and is switched in a separately derived system.

 

[dcspector]

My 05' hand book looks normal to me exhibit 250.7 is SDS and 250.6 is non SDS

 

[elohr46]

It is talking about the difference between a separately derived system and a non separately derived system. Please correct me if I am wrong, it looks like the grounded conductor (neutral) is not switched at the transfer switch in a non serarately derived system and is switched in a separately derived system.

What you see is correct. When the neutral is not switched it is not considered a SDS because you are still connected to the utility for grounding and bonding.