Throughout Australian Standard AS 1670.4 – Emergency warning and intercom systems the following lettering heights shall apply;
| Clause | Item | Lettering Words | Height in mm |
|---|---|---|---|
| Cl 2.3 (f) | CIE not requiring interrogation | EWIS | 20 |
| Cl 3.3.2 | EWIS behind door | "EWIS PANEL" or "EIS PANEL" or "EWS PANEL" | 50 |
| Cl 3.3.5 | Zone block plan | General lettering | 3 |
| Cl 3.4.2 | Interface box label | EWIS | 5 |
| Cl 3.6.3 | Cable marking | Red marker | 25 |
| Cl 3.6.6 (d) | Junction box | EWIS | 5 |
| Cl 4.2.4.2 | MCP used for emergency evacuation | EVACUATE | 5 |
| Cl 4.2.4.3 | MCP used for non-evacuation emergency | EMERGENCY | 5 |
| Cl 4.2.4.4 | MCP used for electric door release | DOOR RELEASE | 5 |
| Cl 4.2.4.5 | MCP used for other functions | Word identifying its function | 5 |
| Cl 4.6 (d) | Visual Alarm Device (VAD) | "FIRE" or "EVACUATE" | 15 |
| Cl 4.6 (d) | Visual Warning Device (VWD) | EVACUATE or custom message | Refer to AS 1603.11 |
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