Surge Protection for Dynamic Message Sign

Dynamic Message Sign
Message Display Sign

Overview of NTCIP and NEMA TS 4-2016

NEMA TS 4-2016 Section 10.2 Power Panels states: "A power panel shall be installed in accordance with NEC, it shall contain as a minimum [] voltage surge and lightning protection."

All agencies have placed a greater emphasis on increasing personnel safety by mandating the use of Surge Protective Devices (SPDs), including the NEC & NFPA.

NEMA TS 4-2016 which recognized the threat and subsequent failure of ITS equipment due to transient surges & lightning. (NTCIP 9001)

Threat to ITS & DMS Equipment

A 2017 study commissioned by Electrical Safety Foundation International (ESFI) finds that 94% of those surveyed find surge protection to be significantly important part of facility protection and safety. (2017 ESFI)

ITS Toll Plaza

The solution for Dynamic Message Sign

These standards have only begun to address the expanding role that surge protection plays in preserving the integrity of equipment and, more importantly, protecting the lives of personnel.

The installation of Surge Protective Devices (SPDs) within the ITS Cabinet or DMS Control Circuit is a measure that will not only extend the life of the circuit components but also increase the reliability of the system as a whole.

Selecting an SPD for DMS

NEC/NFPA 70 require that Surge Protective Devices (SPDs) shall be UL1449 Listed . This means selecting a surge protector is easier than it has ever been. There are only a few choices available for SPDs that are UL Listed for any of the most commonly used surge standards including UL1449 5th Edition, UL497B, and UL497E, in addition, only UL Listed Surge Protectors are acceptable for facilities that will install a Lightning Protection System (LPS) certified to either NFPA 780 or the UL96A Master Label.

Recommended SPD for Main Service Panel

LocationEquipmentSystemSurge Protector Model#Link
Main Panel with M50 Main Service Panelboard120/240Vac MDS750E-120T MDS750E-480D

Recommended SPD for Lighting Control Cabinet

LocationEquipmentSystemSurge Protector Model#Link
ESS Control and Monitoring Cabinet Control Panel120/240Vac
Power Input
DS73US-120T/G DS73US-120T-G

Power Supply120Vac
Power Input
DS72US-120S/G DS72US-120S/G

Power Output
DS220S-24DC DS220S-24DC

Traffic ControllerEthernet Cat 6A MJ8-C6A MJ8-C6A


RS485 DLA-12D3 DLA-24D3 v.2

4-20mA DLA-24D3 DLA-24D3 v.2

Wireless P8AX09-6G-N/FF P8AX09-6G-N-FF

Contact us to develop a surge mitigation solution for your application

Where to purchase Citel SPD's


1ANSI C62.41, Low-Voltage AC Power Circuits
2UL1449 4th Edition, Surge Protective Devices
3UL1449 5th Edition, Surge Protective Devices
4UL497B, Surge Protectors for Data Lines and Fire-Alarm Circuits
5UL497E, Antenna Lead-in Conductors
6IEC 61643-11, Low-Voltage Surge Protective Devices - Part 11: Surge Protective Devices Connected To Low-Voltage Power Systems - Requirements And Test Methods
7IEC 61643-21, Low Voltage Surge Protective Devices - Part 21: Surge Protective Devices Connected To Telecommunications And Signalling Networks - Performance Requirements And Testing Methods
8IEC 61000-45, Electromagnetic Compatibility (EMC) - Part 4-5: Testing And Measurement Techniques - Surge Immunity Test
9CSA 22.2
10NOM-001-SCFI, Standard for Electronic Equipment
11NOM-003-SCFI, Electrical Products - Safety Requirements