What Is The NEC Definition Of A
Dwelling Unit?

NEC Article 230.67 definition of dwelling unit includes your home.

Per the National Electric Code (NEC 2023), a dwelling unit is a single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking and sanitation. Your home is a dwelling unit as well as Hotels, Hospitals, Dormitories, Barracks, Assisted Living Facilities and Apartment Buildings. The NFPA 70 Article 230.67 states: .

The M50-120T-A is installed via a 2-Pole 30A circuit breaker and will not only protect the main service panel but all smart applicances and electronics in the home like your oven, refrigerator, dishwasher, security system, televisions, ev chargers, etc... This protector is what is referred to as a "Whole House Surge Protector".

In addition, the NEC 2023 Article 230.67 futher states that the location for installation of the SPD, the SPD type and Replacement of Service Entrance Equipment shall follow these rules,

Examples of Dwelling Units
Article 230.67 Surge Protection for Hotels
Article 230.67 Surge Protection for Hospitals
Article 230.67 Surge Protection for Barracks
Article 230.67 Surge Protection for Apartment Building
Article 230.67 Surge Protection for Row Houses

Manufacturer
UL File #	E326289
Model	M50-120T-A
Product Image
UL.com Ratings
SPD Type	1
Volt (V)	240/120
AC/DC DC PV	AC
Phase	1S
Amps (A)	n/a
Ambient Min (C)	-35
Ambient Max (C)	80
Mode
	L-L L-N L-G N-G
VPR (Vpk)
L-L L-N L-G N-G	1200 700 1200 1200
MCOV
L-L L-N L-G N-G	280 140 140 120
In (kA)	20
SCCR (kA)	150
Additional Data Sheet Ratings
Surge Current Rating (kA)	50
Protection Circuit	Hybrid TMOV+GSG
Leakage Current	No
TOV Optimized	Yes
Diagnostics	LED Audible Alarm
Environmental Rating	NEMA 4X NEMA 6 (submersible)
Warranty	10-year
Connected Equipment Warranty	10-year $7,500

10108 USA Today Way Miramar, FL 33025 USA	Contact us to develop a surge mitigation solution for your application
citel.us	Where to purchase Citel SPD's