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Type AT Signal - Alstom

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Theory of Operation<br />

Figure 2–4 is a wiring diagram of a typical three aspect LED signal (one aspect blank)<br />

configured red, blank, red.<br />

The signal wiring shown in dotted lines represent field wiring of four-conductor number<br />

14 AWG cable.<br />

R<br />

1<br />

2<br />

X<br />

R<br />

1<br />

2<br />

ACX<br />

xxxRG<br />

Figure 2-4. Typical <strong>Type</strong> <strong>AT</strong> 3 Aspect LED <strong>Signal</strong> Wiring Diagram<br />

(Center Aspect is Blank)<br />

P2502, Rev. Apr/08 2–6 <strong>Alstom</strong> <strong>Signal</strong>ing Inc.

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