How many spaces does the new Surgelogic/SurgeLoc Branch mounted SPD take up in a Panelboard

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Issue:
Spaces that take up in a panelboard the new Surgelogic/SurgeLoc branch mounted SPD

Product Line:
Surge Protection Devices

Environment:
SPD, Surgelogic SurgeLoc, NQ panelboard

Cause:
Product Features clarification

Resolution:
Old Integral (Internally mounted) TVSS devices required up to 18" of extra box height to install in panelboards, but the SurgeLogic SPD does not require additional enclosure height to mount.
The Surgelogic SPD requires 12 single pole spaces , 6 on each side, in NQ Panelboard interiors . Since 42 circuit and 54 circuit interiors require the same box size , ordering a the 54 circuit interior allows you to keep the 42 circuits and have the branch mounted SPD taking the remaining 12 spaces. This allows the original 42 circuit amount of branch breakers needed as well as the integrated Surgelogic TVSS SPD Device to be mounted in the same height box.