User`s manual

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7
1-2 BENEFITS
The DEFENDER HE DE1 is designed to fit the needs for virtually all power conditioning
and DE1 applications. It has been specifically designed to power all forms of lighting
and emergency lighting equipment. The DE1 does not require any derating as other
DE1 products may when powering 100% electronic loads including switch-mode power
supplies.
Electrical disturbances can come from practically anywhere: from the incoming power
lines and from within a building. Outside electrical disturbances include lightning strikes,
utility switching, brownouts, and accidents. Electrical disturbances from within the
building can be caused by load cycling (elevators, HVAC systems) fault conditions,
welders, and other electrically noisy equipment. Whether the electrical disturbances are
generated outside or from within the facility, the following power problems will occur:
• Complete power outages
• Brown-outs including momentary sags
• Voltage surges
• Transients including common-mode and transverse-
mode noise
• Frequency shifts and fluctuations