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(A) Surge-Protective Device
All services supplying dwelling units shall be provided with a surge-protective device (SPD).
(B) Location
The SPD shall be an integral part of the service equipment or shall be located immediately adjacent thereto.
Exception: The SPD shall not be required to be located in the service equipment as required in (B) if located at each next level distribution equipment downstream toward the load.
(C) Type
The SPD shall be a Type 1 or Type 2 SPD.
(D) Replacement
Where service equipment is replaced, all of the requirements of this section shall apply.

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