KKK-A-1822 E
3.7.7.3 INTERNAL 12 VOLT DC POWER (REFERENCE FIGURE 5A or 5B).
Unless otherwise specified by the purchaser, two automotive "Power Point" type connectors
shall be furnished (see 6.2-s),in the patient compartment. Each connector shall be rated for 12
volt DC, 20 ampere capacity, and be on a separately protected circuit. This circuit shall also
include a (low voltage drop) "Schottky" diode to isolate medical equipment batteries from any
electrical loads that the remainder of the ambulance electrical system may impose. The "Schottky"
diode shall be heat-sink mounted, have an inverse voltage rating of at least 45 volts and also be
rated to carry the maximum short circuit current, until the circuit breaker opens. The diode shall
be physically located in an accessible location and be electrically connected between the circuit
breaker and the "action wall" mounted connectors. When specified (see 6.2-s), the receptacles
shall be a military type connector of the following generic designation, MS3112E12-3S or its
interchangeable commercial equivalent. The polarity of the connector shall be as follows: Pin A
(+ 12V), Pin B (Ground), Pin C (not used). The receptacles shall be located on a vertical
surface of the "action wall" or other location specified by the purchaser. The mating plug attached
to the medical equipment shall be an MS3116F12-3P or its interchangeable commercial equivalent.
The polarity for the plug shall be the same as above. Two unwired plugs shall be furnished and
tagged with polarity requirements, and shall be plugged into the connectors. (NOTE: These
connectors are widely available directly from most major industrial electronics distributors.)
3.7.7.4 MASTER MODULE DISCONNECT SWITCH OR DEVICE.
This switch (see Figure 5A or 5B) shall be located in the driver's compartment, be legibly
marked, illuminated when "ON", and rated to carry at least 125 percent of the circuit's
maximum current.
3.7.8
115 VOLT OR 115/230 AC UTILITY POWER (REFERENCE FIGURE 6).
Unless otherwise specified, the ambulance shall be furnished with a 2-wire plus ground 115
volt AC wiring system that is separate and distinct from the vehicle's 12 volt DC wiring
system(s). The AC electrical system, including wiring and associated equipment, shall
comply with AMD Standard 009. Listing shall be by a nationally recognized testing
laboratory, recognized by OSHA under Appendix A to 29 CFR 1910.7. The AC system is
to be utilized while the vehicle is stationary for powering maintenance devices, medical
equipment battery chargers, and when specified (see 3.15.3 & 6.2), vehicle battery
conditioner/charger, and any other device(s) deemed necessary by the purchaser. The AC
system shall incorporate a ground fault circuit interrupter (GFCI) device and a minimum
15 ampere circuit breaker which can be used as a master AC disconnect switch. The GFCI
and circuit breaker may be an integral unit. The AC wiring shall utilize stranded wire in
armored cable, nonmetallic sheathed cable, "Type SO" or better flexible cable rated at
600V and 90° C., covered with a minimum 149° C (300° F). flame retardant wire loom, or
approved wire in conduit.
When an onboard AC supply is specified (see 3.7.8.3), an automatic transfer switch shall be
furnished which turns off this onboard AC supply (interlock) and disconnects its output, when
the AC utility power is applied.
When the 12 VDC battery charger (see 3.15.3-7) and any power plant heater(s) (see 3.15.3-
16) are furnished and connected to this system, they shall be wired so that they can be energized
only from the utility power, and not the onboard AC supply. The onboard AC system shall not
be utilized for operational ambulance interior lighting, such as dome and cot lights.
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