Guest Craig Posted June 29, 2018 Report Share Posted June 29, 2018 Hi What is the difference between a bs5839-1 L1 system and a Grade A: LD1 system? Quote Link to comment Share on other sites More sharing options...
Tom Sutton Posted June 29, 2018 Report Share Posted June 29, 2018 None. Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted June 29, 2018 Report Share Posted June 29, 2018 The equipment is identical, the main differences are the design criteria: - Audibility: Different requirements, e.g. Part 1 requires 75dB at the bed head of a bedroom, Part 6 only requires 85dB at the open bedroom door - Warning for the hearing impaired: Again different requirements, more detailed and stricter in part 1 - Manual Call points: Differing requirements for call point location, not always required and different location requirements in Part 6 - Capacity of standby batteries: Generally greater for Part 6 systems (72 hours instead of 24 hours) - Radio linked systems: Different requirements (largely similar though) Quote Link to comment Share on other sites More sharing options...
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