FCU

Fire Control Unit
Found on http://www.translationdirectory.com/glossaries/glossary262.php

FCU

(CONTROL SYSTEMS GLOSSARY) Field Control Unit.
Found on http://www.instrument-net.co.uk/control_systemglossary.html

FCU

Front Control Unit
Found on http://www3.sympatico.ca/dhaughey/j1930.htm

FCU

Fused Connection Unit - commonly used in kitchens to connect fixed appliances to the ring main. Also SFCU which is an FCU with a switch - usually double pole so isolates both live and neutral to the appliance - but NOT the earth. Also commonly referred to as fused Spurs
Found on http://basic1.easily.co.uk/039069/01C053/electrical_glossary.htm
No exact match found