SSEL transformers offered on the Polish market are IEn certified.

SSEL's production facilities have an accredited NABL laboratory with a modernised test centre equipped with state-of-the-art measurement equipment. The lab performs:

• All routine tests and temperature rise tests according to national and international standards.
• Special tests such as noise level measurements, zero and harmonic impedance measurements without load, magnetic balance tests, etc.
• Pressure tests in accordance with the relevant standards.
• Lightning impulse tests.