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What sets Type 1 and Type 2 Surge Protective Devices (SPD) apart from each other?

Issue:
What sets Type 1 and Type 2 Surge Protective Devices (SPD) apart from each other?

Product Line:
TVSS/SPD

Environment:
Application

Cause:
Clarification

Resolution:

​​​​​​​Type 1:
These are SPDs that are hard-wired and permanently connected. They can be installed between the secondary side of the utility service transformer and the line side of the main service equipment's overcurrent protective device, as well as on the load side of the main service equipment.

Type 2:
These SPDs are designed specifically for installation on the load side of the main service equipment overcurrent protective device. While they can also be installed at the service entrance point, it is essential that they are installed on the load side of the main service overcurrent protective device.

Type 1 and Type 2 Surge Protective Devices (SPDs) are designed for different points of protection within an electrical system. Type 1 SPDs are typically installed on the line side of the service entrance, offering protection from external surges and direct lightning strikes. Type 2 SPDs are installed on the load side of the service entrance or distribution panels, providing protection from internal surges and indirect lightning strikes. Both types work together to provide comprehensive surge protection for electrical systems.

*Note: Check the wire range on the lugs for the SPD , ensuring that the wire size and number of conductors being connected, are within the range of the lug.

https://www.ul.com/sites/g/files/qbfpbp251/files/2019-05/CP-Pricing-SPD-0717.pdf

Schneider Electric Mexico

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