(19)
(11) EP 0 852 367 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.01.2000 Bulletin 2000/02

(43) Date of publication A2:
08.07.1998 Bulletin 1998/28

(21) Application number: 97122169.2

(22) Date of filing: 16.12.1997
(51) International Patent Classification (IPC)7: G08B 13/14
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 04.01.1997 GB 9700094

(71) Applicant: SIEMENS MEASUREMENTS LIMITED
Oldham, Lancashire OL9 7JS (GB)

(72) Inventor:
  • Hamer, Mark Joseph
    Littleborough, Rochdale OL15 OEE (GB)

(74) Representative: Allen, Derek 
Siemens Group Services Limited, Intellectual Property Department, Siemens House, Oldbury
Bracknell, Berkshire RG12 8FZ
Bracknell, Berkshire RG12 8FZ (GB)

   


(54) Security system


(57) A security system for locating items of electrical equipment, which is comprised of security identification units and a controller unit, the security identification units being located within the items of electrical equipment. To provide power to the items of electrical equipment they must be connected to a power distribution network, which may be a national electrical grid or 'mains' supply. In use the security identification units are arranged to communicate identification data with the controller unit via the electrical power distribution network, thereby providing an indication of a presence or an absence of at least one of the items of electrical equipment.






Search report