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Surge Protective Device for Lighting Panel


General Notes

  • Walk through WALMART store and identify all power panels that have breakers to ANY type of lighting. This includes indoor, outdoor parking, outdoor signage, and refrigeration.

  • Hxx panels will be labeled 277/480Vac.

  • Typically, there will be 4 to 5 “Hxx” panels in each store. Because the stores are unique, immediately determine if you will have enough Surge Protective Devices (SPDs), MS200-277Y-C for 277/480Vac panels. If not, use SPDs from other stores but immediately request more SPDs to finish the project.

  • Locations of these panels are normally in back of store's electrical room. Any rooms at front of the store (used for parking lot lights), automotive power panel and grocery power panel. The store manager may have to take you to all panels for your viewing. If it doesn’t say “Lighting” on panel card then it does not require a Surge Protection Device (SPD).

  • If space or lack of spares don’t allow for installing the SPD into each panel, Some Hxx panels share the same power source and (example: HC1 Sec 1 and HC1 Sec 2) if both panels are side by side (less than 3 feet) then a single MS200-277Y-C can be installed instead of one SPD per panel. Installer should first shoot photo of issue and contact project manager.

  • Surge counters should be set to ZERO before leaving panel.

  • A photo of the UPDATED power panel card, after installation of SPD, MUST be taken.

  • Before leaving panel, photos should be taken with SPD green LED lights displayed and the panel number clearly in the picture.

  • Proceed to installation once panels are identified and SPDs are counted.


1. Open panel to expose wires and breaker connections.
2. Select spare breakers for the SPD.
3. If no spare breakers are in the panel but there is a breaker slot for a 3-phase breaker, install a 20 Amp 3-phase breaker to act as a disconnect for the new SPD.
4. Wires should be measured to the 3-phase breaker and cut to shortest length possible.
5. Make sure all phases are being protected by a colored lead from the SPD.
6. MS200-277Y-C SPD should be fed into power panel using flex conduit.
7. Distance of SPD should be as short as possible.

If there is NO SPARES in the panel then review the following:

  • Make sure breaker selected is NOT critical to the safety of store customers. Normally, the breaker selected is for an outlet.

  • Square D panel breakers are designed to allow two wires to be connected to a breaker.

  • GE or Cutler Hammer require a Y or 3-way crimp lug so a single wire is fed into a breaker.

  • The SPD, according to National Electric Code, can be wired this way because it only draws current in the micro-Amps. See figure below of NEC acceptable wiring.




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