230.67 Surge Protection.

This SPD is in a subpanel downstream of the service. The SPD is not required to be in the service equipment as permitted in (B) if located at each next level distribution equipment downstream toward the load.
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This SPD is in a subpanel downstream of the service. The SPD is not required to be in the service equipment as permitted in (B) if located at each next level distribution equipment downstream toward the load.

Code Change Summary: New code section. Surge protection is now required for all dwelling unit services.

In the 2020 NEC, a Type 1 or Type 2 surge protective device (SPD) will be required for dwelling unit services. The SPD may be integral to or adjacent to the electrical service. Additionally, an SPD will be required when an existing service is replaced.

The code committee statement regarding the new code section expressed that this code change addresses the need for surge protection to properly protect the sensitive electronics present in most modern appliances as well as safety devices (AFCI, GFCI and smoke/carbon monoxide detection) and other equipment commonly found in dwellings.

Below is a preview of the NEC. See the actual NEC text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2020 NEC edition of NFPA 70.

2017 Code Language:

This code section did not exist.

2020 Code Language:

N 230.67 Surge Protection.

N (A) Surge-Protective Device. All services supplying dwelling units shall be provided with a surge-protective device (SPD).

N (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.

N (C) Type. The SPD shall be a Type 1 or Type 2 SPD.

N (D) Replacement. Where service equipment is replaced, all of the requirements of this section shall apply.

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230.67 Surge Protection.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Based on the 2020 NEC, which of the following is true?

A: An SPD must be provided when an existing dwelling electrical service is replaced.
B: The SPD shall only be installed inside the service equipment.
C: The SPD shall be a Type 3 or Type 4 SPD.
D: The requirements in this section shall not apply when a dwelling electrical service is replaced.
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