Installing a Dell UPS Network Management Card

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http://serverfault.com – I have a network management card I need to install into our Dell UPS. Do I need to power-off the UPS first before installing the card, or can I just plug it in? The manual says it's as simple as slotting it into the rear of the UPS but doesn't mention if you have to power down first. EDIT: The UPS is a Dell 2700W Rack/Tower (HowTos)