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Securing the EMP barrier

Efficient EMC solutions.

Securing the EMP barrier

Norway is in the forefront when it comes to national preparedness regulations for protection of power substations against EMI, electromagnetic interference, and EMP, electromagnetic pulses.

Since 2004, transmission system operator Statnett evaluates Roxtec EMC seals as one out of several tools for protection against threats such as HEMP, high-altitude electromagnetic pulse, and IEMI, intentional electromagnetic interference, in their power substations.

Terrorism, enemies in warfare and natural phenomena such as lightning count as threats to the power distribution. HEMP and IEMI incidents must not interfere with the transmission system. Norwegian preparedness regulations are strict to ensure safety – and a stop in the power supply would cost millions.

Sealing and shielding

Several transformer stations throughout the country are equipped with the Roxtec EMC system ES. According to Roxtec, the system combines sealing with electromagnetic shielding. The cable entries are tailor-made as huge boxes to ensure shielding but also to simplify installation – which can be seen as an example of how Roxtec provides technical support to cover customer needs.

Prepared for the future

Between 100 and 300 signal cables enter the control room through two boxes with Roxtec EMC transits under the raised floor. Roxtec has developed a solution making it possible to open the box covers and seals to add cables. Gunnar Svendsen appreciates this feature for the future: 

"Our stations operate for typically 20-25 years, so we need to replace and add equipment."

Statnett uses standardized attenuation tests for shielded rooms in order to verify compliance with national requirements.
Gunnar Svendsen, Statnett

80 Statnett transformer stations utilize the Roxtec EMC system.

Why use Roxtec?

  • Certified protection
  • Easy to use and install
  • Customized solutions
  • Flexibility for cables of different sizes
  • Built-in spare capacity for future needs

Download the pdf-version of the Statnett, Norway case.

Statnett, Norway

Project facts

Project description

Electromagnetic shielding of control rooms in transformer stations

Involved companies



Sealing of signal cables entering a shielded area

Sealing requirements

EMI/EMP protection

Roxtec products

Customized EMC boxes with Roxtec EMC solutions (Roxtec ES transits)