Electrical installation and wiring
98-158751-C Chapter 4: Installation 4-11
Description of the MCHPA power supply
+115 VAC Power (BP1, BP7)
The target line impedance should be as low as possible; 1 Ohm preferred maximum;
should not exceed 4 Ohms.
Required current capability for the Circuit Breaker: 300 W @ 90 VAC which equals
3.33 A at the required environmental conditions. A suitable circuit breaker is Klixon 2TC
series with 5 A current rating.
Chassis Ground (BP8)
The chassis connection makes sure that the cabinet and the installation tray has the same
potential, and that there is a connection from the wiring shields to the cabinet for EMC
(ElectroMagnetic Compatibility) purposes.
Connect the wire directly to the installation tray, and to aircraft chassis.
Cable requirements, MCHPA power supply (AC)
Important
Use a separate 5 A circuit breaker for the AC input.
Cable
a
a. The cable numbers refer to the numbers stated on the wiring drawing in the section To wire
the MCHPA with AC input on page 4-10.
Maximum resistance Other Requirements
[1] 115 VAC Line and
neutral
1 , incl. circuit breaker
[2] Chassis Ground 25 m Connect directly to the
aircraft chassis.
Table 4-4: Requirements to CSDU power cables (AC input)
Note
Maximum cable lengths are calculated and listed in the section Allowed cable
lengths for power cables on page 4-37.
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