Type AT Signal - Alstom
Type AT Signal - Alstom
Type AT Signal - Alstom
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Introduction<br />
Table 1–1. <strong>Type</strong> <strong>AT</strong> <strong>Signal</strong> Basic Housing Dimensions<br />
Dimension 3 Aspect Single Aspect<br />
Height 28.75" (73 cm) 9.75" (24.8 cm)<br />
Width 8.60" (21.8 cm) 8.60" (21.08 cm)<br />
Depth 9.69" (24.6 cm) 9.69" (24.6 cm)<br />
Outer Lens Diameter 5.0" (12.7 cm) 5.0" (12.7 cm)<br />
1.3.2. Lens Assembly<br />
The lens assembly of a <strong>Type</strong> <strong>AT</strong> <strong>Signal</strong> aspect, whether incandescent or LED, consists<br />
of a colored (Green, Yellow, or Red) lens and a mounting ring that holds the lens to the<br />
signal case. See Figure 1–3 for lens detail.<br />
LENS<br />
GASKETS<br />
LAMPS AND LAMP<br />
RECEPTACLES (2)<br />
LENS<br />
GASKETS<br />
LED LAMP UNIT<br />
TERMINAL POSTS<br />
BEZEL<br />
RING<br />
BEZEL<br />
RING<br />
LED UNIT<br />
OUTER<br />
LENS<br />
SCREW &<br />
WASHER<br />
GASKET<br />
LIGHTING<br />
TRANSFORMERS<br />
TERMINALS<br />
OUTER<br />
LENS<br />
SCREW &<br />
WASHER<br />
TYPE <strong>AT</strong> SINGLE ASPECT INCANDESCENT SIGNAL<br />
GASKET<br />
CENTERLINE OF<br />
OUTER LENS &<br />
LAMP UNIT LENS<br />
LED LAMP UNIT<br />
MOUNTING SCREW<br />
& WASHER<br />
TYPE <strong>AT</strong> SINGLE ASPECT LED SIGNAL<br />
Figure 1–3. Typical <strong>Type</strong> <strong>AT</strong> <strong>Signal</strong> Active Light Compartment<br />
P2502, Rev. Apr/08 1–5 <strong>Alstom</strong> <strong>Signal</strong>ing Inc.