What is NEMA LS 1?
NEMA LS 1 is a surge protector performance standard. A surge protector which meets this standard is typically used in the most hostile surge environments, at the service entrance location. Other protector locations such as branch panel and local panel protection usually do not require such a formidable protector.
NEMA LS 1 is a voluntary guide established by various manufacturers of surge protection devices under the auspices of the National Electrical Manufacturers Association, which primarily designates how surge protective devices should be specified. This includes labeling and testing. Purchasers of SPDs are encouraged to ensure their supplier adheres to this guide. An example of the value of LS 1 is its ability to define key parameters in simple to understand terms. These include functional description, protection modes, clamping voltages, safety agency approvals, etc.
