Ensuring a safe and stable environment: Standby power for hospital applications

In March 2015, Arrowe Park Hospital in the Wirral suffered a massive power failure. These power problems caused operations to be cancelled and ambulances to be diverted. Although all wards and clinical areas were served by an emergency power supply and continued to function normally, the incident highlights the critical dependence of medical environments on a clean, uninterrupted power supply.

This dependence is driven by two power vulnerabilities. The first relates to the use of sensitive electronic equipment for operations, and for patient monitoring and treatment. The second arises from the essential role of IT and communications equipment to manage patient records, schedule appointments, allocate resources and perform other administrative functions.

Operating Theatre BackUp Power - UPS

Legislative requirements for medical environment standby power

Accordingly, legislation exists that hospital power infrastructures must comply with, to ensure power integrity and continuity throughout different power failure scenarios. IEC 60364-7-710 applies to electrical installations in medical locations, to ensure the safety of patients and medical staff. Its requirements mainly cover hospitals, private clinics, medical and dental practices, health care centres and dedicated medical rooms in the workplace.

Health Technical Memorandum HTM06-01 (Part A) provides guidance for all works on the fixed wiring and integral electrical equipment used for electrical services within healthcare premises. It should be applied to all forms of electrical design work from greenfield sites to modifying an existing final subcircuit. Part B addresses the operational management and maintenance of the electrical service supply and distribution within any healthcare facility.

Both documents provide guidance to healthcare premises managers on how European and British electrical safety standards such as the IET Wiring Regulations BS7671, the Building Regulations 2000 and the Electricity at Work Regulations 1989 can be used to fulfil their duty of care in relation to the Health and Safety at Work etc Act 1974.

This legislation demands that in all medical locations where isolated power is installed – defined as Group 2 and Group 5 by BS 7671 – power for life supporting equipment must be restored within 0.5 s of a power interruption. It also states that “Certain microprocessor controlled equipment may require a no-break power supply”.

UPSs and generators as standby power solutions

A UPS system from a reputable supplier can successfully deliver the no-break power capability demanded by the legislation, while also protecting all the sensitive medical, IT and communications equipment from the dangers of supply power disturbances during normal mains operation. However, a power cut lasting for several hours or more rather than just a few seconds is always possible and must be allowed for.

This means that a power solution that is truly resilient and sufficient for a medical centre’s needs should comprise a UPS and standby generator working in partnership with one another. The UPS system provides the power filtering and no-break capability, then if the power blackout duration starts to threaten the UPS battery autonomy, the UPS can signal the generator to start, and allow it sufficient time to come on-line and synchronise smoothly.

Kohler Uninterruptible Power Ltd can supply integrated UPS-generator packages that meet the particular needs of each user; we ensure that the UPS and generator products are not only correctly specified as independent parts, but also configured to work smoothly with one another as a complete standby power solution.

Diesel Generator UPS Schematic

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