FAQ

42
new and significant change from the previous
2020 NEC language.
Leviton Solution
Type 2 Surge Protection Devices (SPDs) would typically
be the type of device most often associated with this
Code article. See Type 2 Below.
Here we have provided an explanation of the dierent levels of
surge protection and their applications:
continued from page 40
Type 3 SPDs are typically
surge receptacles or cord
connected point-of use
devices. Leviton oers a
complete assortment
in duplex and quad in many
styles and colors.
Surge Receptacles
and Strips
Type 2 SPDs are typically service
entrance SPD panels or branch
circuit SPD panels that are
connected on the load side of
the service disconnect overcurrent
device (main service panel).
Type 1 SPDs for the supply side of
service entrance.
Surge
Breakers
Cat. No.
51120
Cat. No.
51110-SGR
Type 1 and Type 2 SPDs shunt external surges that originate from
utilities or disturbances outside the home or facility. Type 2 SPDs
can protect for both internal and external surges when located at
the branch. Type 3 SPDs can shunt surges that originated internally
within the home or facility. So a comprehensive strategy for surge
protection typically involves a Type 1 or Type 2 SPD and also a
Type 3 SPD at point of use.
Type 4 SPDs are component
assemblies consisting of one or
more Type 5 components
together with a disconnect
(integral or external) or a means
of complying with the limited
current tests in UL 1449.
Type 5 SPDs Discrete component
surge suppressors connected
by its leads or provided with an
enclosure with mounting means
and wiring terminations.