Execution and maintenance of electrical installations, air conditioning, industrial cold and telecommunications. Design, installation and maintenance of fire protection installations for systems: automatic detection, water supply, external hydrants, fire extinguishers, fire hydrants (BIE's), dry column, fixed extinguishing by automatic sprinklers and water spray, fixed extinguishing by water mist, extinguishing by powders, extinguishing by gaseous agents, extinguishing by physical foam, extinguishing by condensed aerosols, for smoke and heat control and luminescent marking