UNDERWRITERS LABORATORIES® COMPLIANCE VERIFICATION SHEET
The following model number is listed under Underwriters Laboratories® (UL) 1076 for Proprietary Burglar Alarm Units and
Systems, UL 294 for Access Control Systems Units and Underwriters Laboratories of Canada ULC/ORD-C1076-86.
CK721-A
When installed at the site the following requirements must be met to comply with these standards.
1. Transient protection devices that are installed must not be removed or defeated.
2. The CK721-A shall be mounted in subassembly S300-DIN-L or S300-DIN-S.
3. The CK721-A in combination with the S300-DIN-L or S300-DIN-S must be connected to a UL Listed Uninterruptible
Power Supply that provides a minimum of 24 hours of AC emergency power.
4. The tamper switch must be enabled at all times.
5. Systems requiring the use of network hubs, routers, bridges, network switches or the like shall guarantee these devices are
UL Listed for fire and shock in the category control number (CCN) NWGQ and/or EMRT. These devices shall be installed
in a temperature-controlled environment. The temperature-controlled environment must be maintained between 13 - 35°C
(55 - 95°F) and relative humidity of 85 ± 5% by the HVAC system. Twenty-four hour standby power shall be provided for
the HVAC system.
6. The installer shall incorporate a supply line transient suppression device complying with the Standard for Transient Voltage
Surge Suppressors, UL 1449, with a maximum rating of 330 V. Supply line transient suppression device is to be used with
the power supply to the network hub(s) routers, bridges and/or network switches.
7. External network hubs, routers, bridges or network switches must use signal line transient suppression devices complying
with the Standard for Protectors for Data Communications and Fire Alarm Circuits, UL 497B, with a maximum marked
rating of 50V.
8. In the CK721-A user-interface, the “Network Polling [LAN]” parameter must not exceed 90 seconds.
9. Modems shall not be used for primary connection to the host computer. Modems have only been investigated by UL for
supplementary use.
10. The following elevator interfaces have not been investigated by Underwriters Laboratories: Kone, Otis, and ThyssenKrupp.
11. Do not connect equipment to an AC power source that is controlled by a switch.
12. UL 294 Performance Levels:
Destructive Attack Level I
Endurance Level IV
Line Security Level II
Standby Power Level IV
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