Established 1984

Specialising in lighting solutions for over 25 years

DC Emergency Systems Limited has uniquely grown its business by referrals by offering support services to existing service providers operating primarily in the lighting market within the UK.




DC's new Digital Self-Test Adapter, DST™, is a unique, fully automatic, independent, self-testing module that complies with the requirements of BS5266 and the forthcoming International Standard for automatic testing devices, IEC62034 and unlike many is suitable for incorporation into virtually any nickel cadmium or nickel metal hydride powered, self contained emergency lighting luminaire.

The DC's, DST™ is flexible and can be specified to be included in virtually all of the self contained luminaires available from DC, including all conversion kits and is ideally suited to retrofitting even when non-DC conversion units have been installed.

The DST™ is thorough and carries out the monthly, six monthly and yearly test regime contained within BS 5266 without need for manual intervention. When the unit detects a fault condition it provides both a visual and an audible alarm indication (if not required, the audible alarm can be simply disabled when the DST is commissioned).

DST™ is reliable and even when it has failed its associated luminaire for duration or light output discrepancies, it will still allow the luminaire to operate to the best of its ability in its emergency mode.

Additionally, the DST™ has a non-volatile memory so if the power fails the clock is suspended but the test sequence remains unaltered. When the mains power is restored they simply carry on from the point at which power failed.

On initial power up the DST's intelligence allows it to enter a battery pre-conditioning mode to ensure the batteries are in a suitable condition to supply sufficient power for emergency operation. Testing, initiation and clock resetting are carried out via a single discrete push button.


DC's DST™ Standard Testing programme conforms to the requirements of BS5266

Monthly: 1 minute, functional test
6 Monthly: 1 hour, duration test
Annually: 3 hour, full rated duration test

DC's DST™ LED Status Reports are made via a single tri-colour LED, (standard LED colours may be altered within the scope of pr IEC62034 to suit individual requirements).

Continuous GREEN LED: Mains, battery, charger and previous test correct
Continuous RED LED: Test in progress Flashing
AMBER LED: Test fail alarm *
(With optional sound alarm)
LED off: Mains failure or battery faulty

*If a fault is detected the sounder will enter a cycle where it emits a fast-bleep for 5 minutes, it will then sound every 10 seconds until 4 hours have elapsed and if during this time it has not been reset or the test reinitiated the sound alarm will repeat the alarm cycle. A single bleep only will be emitted during manually initiated tests.

Dimensions (millimetres)
Height: 30 x Length 130 x Width 50
Fixing centres: 120
Weight: 80 grms.

Ordering Codes
DST - 3 cell: Suitable for 3 cell batteries;
DST - 4 cell: Suitable for 4 cell batteries;
DST - 5 cell: Suitable for 5 cell batteries;
DST - 6 cell: Suitable for 6 cell batteries

When ordering please specify requirement for T5 or T8 fixing kit. Special versions of the DST™ can be ordered to suit non-standard battery types and sizes.