LOADS ON THE ALTERNATE SOURCE. The alternate power source will
have sufficient capacity to supply the essential electrical system of the
hospital as outlined in NFPA-70, as modified herein, and as required by items
listed in Appendix A of MIL-HDBK-1191. Avoid oversizing of generator sets such
that load banks are needed for testing under load as required by accreditation
authorities. Note that operating generators at low loads leads to fouled
combustion, and unreliable performance. The essential electrical system
consist of two parts: the emergency system and the equipment system. The
emergency system will consist of two branches: the life safety branch and
critical care branch. The life safety branch shall have no loads connected to
it other than those loads identified in NFPA-70 and 99. The failure of a
critical branch component between the area and the transfer switch could
render the entire section without power. Supplying a mixture of normal,
critical, and even equipment branch power to critical areas is more reliable
and is recommended in NFPA-99. The essential equipment system will serve all
essential equipment listed in NFPA-70 and 99. Additional loads may be added to
the critical branch or equipment system by the using Military Department as
needed if it improves hospital operations. The power and lighting loads for
the following areas will be connected to the critical branch:
Delivery rooms,and Labor and delivery rooms.
Oral Surgery, Maxillofacial surgery, Perodontics, and
Recovery (surgery, and labor recovery beds).
Coronary care units (patient bedrooms).
Intensive care unit (patient bedrooms).
Emergency care units (treatment/trauma rooms and cubicals).
Labor rooms (including stress test and
Intensive care nursery.
Angiographic exposure room.
Hemodialysis (patient station).
Surgery suite preparation and hold.
Special procedure room(s).
Radiation Therapy (including simulator room).
Nuclear medicine (camera room).
ESSENTIAL LOADS. Essential loads are divided into three
categories: Life safety, Critical Care and Equipment. These loads receive both
normal and emergency power. However, dual source critical power is required in
some areas (Appendix "A" of MIL-HDBK-1191, and Service Medical Guide plates as
applicable). This information can be found in the Guide Plates, when issued
for use. The following information derives from the current editions of NFPA-
99 and NFPA-70; Designer's shall refer to the latest editions of these
standards as they become available.
LIFE SAFETY BRANCH LOADS. The life safety branch provides
of normal power source. The following lighting, receptacle and equipment
limitations are as defined by NFPA-70 and 99:
stairway illumination, plus 25% of assembly areas such as dining rooms,
chapels and auditoriums.
Exit signs shall be selected to provide visibility in smoke