Supermarkets - Special Needs

Large supermarkets have a tremendous electrical load. Similar to most other businesses, motors and lights dominate the power consumption. In particular, the motors typically feed freezers and refrigerators, loads that cycle on and off for temperature control. This means an environment ripe for voltage sags and transients.

Added to these somewhat standard loads are all of the electronic devices. Point-of-sale terminals, inventory and administration computers, transaction verification systems, and integrated paging/telephone systems work to make supermarkets even more of a challenge.

Aside from the potential threat from sags and transients, grounding is also a likely culprit. Beware of back-door hits, too.