(g)
Nickel cadmium battery installations capable of being used to start an engine or auxiliarypower unit musthave–

(1)
A system to control the charging rate of the battery automatically so as to prevent battery overheating;

(2)
A battery temperature sensing and over-temperature warning system with a means for disconnecting the battery from its charging source in the event of an over-temperature condition; or

(3)
A battery failure sensing and warning system with a means for disconnecting the battery from its charging source in the event of battery failure.

(h)
[In the event ofa complete loss of the primary electrical power generating system, thebattery mustbe capable ofproviding atleast30 minutes of electricalpowerto those loads that are essential to continued safe .ight and landing. The 30 minute timeperiodincludes the time neededfor thepilots to recognizetheloss ofgenerated power and take appropriate load shedding action.]

Amdt. 23-49, E.. 03/11/96
FAR 23.1357 : Circuit protective devices.
(a)
Protectivedevices, such asfuses or circuitbreakers, mustbeinstalledin all electrical circuits other than–

(1)
[Main circuits ofstarter motors used during starting only; and]

(2)
Circuits in which no hazard is presented by their omission.

(b)
Aprotectivedeviceforacircuitessential to .ightsafety may notbeused toprotect any other circuit.

′
Elodie Roux. Septembre 2003
Subpart F : Equipment
(c)
Each resettable circuit protective device (”trip free” device in which the tripping mechanism cannot be overridden by the operating control) must be designed so that–

(1)
A manual operationis required to restore service aftertripping; and

(2)
If an overload or circuit fault exists, the device will open the circuit regardless of the position of the operating control.

(d)
If theability toreset acircuitbreakerorreplaceafuseisessential tosafetyin .ight, that circuit breaker or fuse must be so located and identi.ed that it can be readily reset or replaced in .ight.

(e)
[For fuses identi.edas replaceable in .ight–

(1) There mustbe one spare of each rating or50percent sparefuses of each rating, whichever is greater; and

(2)
The sparefuse(s) mustbe readily accessibleto any requiredpilot.] Amdt. 23-43, 05/10/93

FAR23.1359:[Electricalsystem .reprotection.]

(a)
[Each component of the electrical system must meet the applicable .re protection requirements of Secs. 23.863 and 23.1182.

(b)
Electrical cables, terminals, and equipment in designated .re zones that are used during emergencyproceduresmustbe .re-resistant.

(c)
Insulation on electrical wire and electrical cable must be self-extinguishing when tested at an angle of 60 degrees in accordance with the applicable portions of Appendix F of this part, or other approved equivalent methods. The average burn length mustnot exceed3inches(76 mm) and the average .ametime after removal of the .ame source must not exceed 30 seconds. Drippings from the test specimen must not continue to .ame for more than an average of 3 seconds after falling.]

Amdt. 23-49, E.. 03/11/96
FAR 23.1361 : Master switch arrangement.
(a)
There must be a master switch arrangement to allow ready disconnection of each electric power source from power distribution systems, except as provided in pa-ragraph (b) of this section. The point of disconnection must be adjacent to the sources controlled by the switch arrangement. If separate switches are incorpora-ted into the master switch arrangement, a means must be provided for the switch arrangement to be operated by one hand with a single movement.

(b)
Load circuits may be connected so that they remain energized when the master switch is open, if the circuits are isolated, or physically shielded, to prevent their igniting.ammable .uidsorvaporsthatmightbeliberatedbytheleakageorrupture of any .ammable .uid system; and
　
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