E3 Series Installation/Operation Manual — P/N 9000-0574:I 11/04/10 181
Section 8: Power-Limited – Non Power-Limited Wiring
UL Standard 864, (Control Units for Fire Protective Signaling Systems), requires that a minimum
of 1/4 inch separation be maintained between power-limited circuits and non power-limited
circuits. The control unit is designed so the required separation between these circuits (power-
limited vs. non power-limited) is maintained at the field wiring terminals.
In order to fully comply with the intent of these requirements, however, the minimum 1/4 inch
separation must also be maintained between the field wiring conductors of power-limited circuits
and non power-limited circuits. This may be accomplished by routing the field wiring as shown in
Figure 8.2.1.
Unless otherwise indicated on the unit, all field-wiring circuits are power-limited except:
• AC power circuit
• Standby battery circuit
• Telephone line connections
• Master Box / Releasing
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