-
wiring of modular terminal blocks (signal) : no plate to be installed.
-The standard electrical items (e.g. resistors) mounted on a terminal block shall be identified by a sleeve NSA 937201. This sleeve (shortened to minimum), is placed on the component tail and must not prevent cooling.
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ELECTRICAL ITEM FUNCTIONAL IDENTIFICATION - Example of marking
Figure 002
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_Splices (VS)
4 _Not removable not reducing
a A group of splices (max. 4) is identified by a label E0248 positioned near the group.
_Diodes and removable splices
b A sleeve is installed on each side of the component.
_Reducing splices
c
No identification sleeve.
_Diode
5 A diode identified by a sleeve NSA935201, on the wire, positioned alongside the diode.
_Pressure Seal (VP)
6 The pressure seals through which the wire bundle passes are identified by two labels E0248 with NSA935402 (Type TY-RAPS), one on each side of the seal.
_Coded equipment items directly connected on aircraft
7 With or without cut-to-length : install a label E0248.
_Specific items
8 All EFCS specific equipment (connectors, terminal blocks, relays, circuit-breakers) are identified clearly and permanently with pink labels (E0248), indelible and clearly visible, bonded to the structure near the items.
_Miscellaneous equipment
9 On circuit breakers, relays, connectors (VC or VD) : no identification label (E0248).
(3) Special cases (Ref. Fig. 003) For marking with E0248 labels and E0470 adhesive labels refer to para. (b).1_ and (b).2_.
(a) Electrical Boxes (large and small VUs) The electrical Boxes have a VU identification label (E0470) and a label with the Aircraft No. (MSN) (NSA931025).
_______
CAUTION : DO NOT USE METAL LABELS IN BOXES THAT CONTAIN ELECTRICAL ITEMS AND WIRING. IF THERE IS CHAFING OF THE CABLE INSULATION OR THE ELECTRICAL COMPONENTS, SUCH LABELS CAN CAUSE SHORT CIRCUITS.
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ELECTRICAL ITEM FUNCTIONAL IDENTIFICATION - Example of marking in small VUs
Figure 003
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(b) Small VUs In Small VUs, the wires (BF or CF type) have the sleeve E0646MF (ex NSA937204 MF) marked with the identification of the connection terminal of the related end. But this type of sleeve is not used for the following items :
-cut-off receptacle (VC),
-modular terminal blocks (VT),
-ground point (VN),
-illuminated VU plugs (LF) if only one wire.
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________________________________________
WIRE BUNDLES - DESCRIPTION AND OPERATION
_______1. General
R The sections that follow give the general design, description and
R requirements related to the installation of electrical wire harnesses on
R aircraft.
R
R ______________________________________2. Structure of the chapters that follow:
R A. Wire harnesses - Wiring (Ref.20-33-1X)
R B. Wire harnesses - Routing (Ref.20-33-2X)
R C. Wire harnesses - Protection (Ref.20-33-3X)
R D. Wire harnesses - Attachment (Ref.20-33-4X)
20-33-00 Page 1
R __________________________________
WIRING - DESCRIPTION AND OPERATION
_______1. General
R The chapters that follow give the general design requirements related to the
R (re)installation of electrical wire harnesses on aircraft.
R
R ______________________________________2. Structure of the chapters that follow:
R A. Manufacture and (re)installation of wiring (20-33-11)
20-33-10 Page 1
__________________________________________________________________
MANUFACTURE AND INSTALLATION OF WIRING - DESCRIPTION AND OPERATION
_______1. General
A. Definition
(1) Cable or wire: A cable is an assembly consisting of a conductor, insulation and, where applicable, a sheath, screen or jacket.
R R R (2) Conductor: The conductor is the conducting element of the cable formed from one or more strands.
R R R (3) Core: Assembly of a conductor and insulation which then form part of a complete single or multiconductor cable.
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