Background
As custodians of one of the world’s most important historical artefacts, Salisbury Cathedral required a highly specialised surveillance system to safeguard its copy of Magna Carta – housed in a controlled low-light environment within the Chapter House.
ARC Fire Safety & Security, a long-term partner of Dahua Technology and trusted security provider at Winchester, Chichester and St Albans Cathedrals, was appointed to take over the servicing of the fire and intruder alarms, as well as the existing surveillance systems at Salisbury Cathedral. During this transition, ARC were also tasked with reviewing and upgrading the surveillance around Magna Carta.
Magna Carta is displayed in a specially designed dark room to prevent light damage. Strict visitor control measures are in place – only one person may enter at a time, and flash photography is strictly prohibited. The surveillance solution had to meet demanding requirements – most notably, that the camera must not face the document directly and must emit less than 10 LUX of light to protect the ancient parchment.
Solution
With the support of Oprema, ARC Fire Safety & Security specified a range of Dahua cameras that met the project’s unique constraints. Central to the installation was Dahua’s 5MP IR Fixed-focal Eyeball WizSense Network Camera (DH-IPC-HDW3541EM-S-S2), selected for its compact design, superior low-light performance and adaptability. To comply with conservation restrictions, the infrared (IR) lamp was disabled and cameras were configured to operate via motion detection only. When a visitor enters the exhibition area, a dim cabinet backlight is activated. This soft, indirect light is sufficient for the Dahua camera to generate high-resolution colour footage without emitting harmful direct illumination. The full deployment of Dahua’s solutions included six strategically positioned cameras to cover Magna Carta, Chapter House, and entrance areas without violating historical preservation protocols.Result
The installation was delivered with precision and sensitivity to the historic environment. ARC Fire Safety & Security and Dahua were able to meet the Cathedral’s requirements entirely, protecting an 800-year-old document while integrating the solution into a larger Dahua-based network infrastructure that is already in place across the site.“The cameras specified met the client’s brief perfectly. Despite the strict requirements around light emission and camera positioning, Dahua’s technology offered a reliable, image-rich solution. This ensures that Salisbury Cathedral’s Magna Carta is protected – discreetly and effectively – from intentional damage or interference.” – ARC Fire Safety & Security Ltd.
With all engineers recently completing Dahua Level 1 certification, ARC Fire Safety & Security is well-positioned to expand this trusted partnership for future heritage projects. The success of this project was made possible by the ongoing dedication of Salisbury Cathedral’s staff, whose careful stewardship of Magna Carta and commitment to its preservation ensure this national treasure remains protected for future generations. Thanks are also due to the Cathedral’s visitor team, whose efforts in guiding guests through this remarkable piece of history continue to enrich the experience for thousands each year.
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