Instruction manual

AC Power and Grounding
2-16
Installation, SPM, Maintenance, and Troubleshooting Supplement
Heavy Lightning Protection 2
The MERLIN MAGIX 491D1 power supply has built-in AC line protection. This
built-in protection handles almost all situations.
Occasionally, additional protection may be needed if the customer is located in
a heavy lightning area. In such instances, the 145D and 146 protectors are
available for the MERLIN MAGIX system as needed.
In addition to providing CO line protection, 146 protectors are designed as In-
Range, Out-of-Building (IROB) protectors. An IROB protector is used when
telephones are installed within 1,000 feet of the control unit but are in another
building. You must use IROB protectors whenever out-of-building telephones
are installed.
Connect a 145D protector to the system to limit surges from the AC lines. For
CO trunk and/or IROB protection, add any combination of 146 protectors
shown in Table 2-3. For an example, see Figure 2-4.
146C and/or the 146F protectors are recommended for CO line
protection at all potential lightning trouble sites.
Table 2-3. Capacities and Recommended Application for 146 Protectors
Protector Recommended Application
146C 4 CO Lines
4 T/R IROB telephones
146D 2 T/R IROB telephones
2 MLS or ETR IROB telephones