8
R
EFERENCE
& I
NSTALLATION
M
ANUAL
2.2 EARTH GROUND
Connect the zone and dialer ground terminals from the control panel to the cabinet and cold water pipe or grounding
rod as per local electrical codes.
For maximum lightning protection, use separate earth grounds for the zone and dialer grounds as
shown in Figure 2-1A.
2.3 AC POWER
Do not use any switch-controlled outlets to power the transformer. Connect the transformer as shown in Figure 2-
1A. Use Table 1 to determine the required transformer.
Table 1: Transformer Requirements Table
Transformer: Min. 16VAC 20VA
UL: Amseco XP-1620
Rec. 16VAC 40VA
UL: Amseco XP-1640
Spectra DC Power Supply rated at: 1.2A 1.5A
Auxiliary Supply can provide a maximum of: typ: 600mA, max: 700mA typ: 600mA, max: 700mA
Acceptable Battery Charge Currents (see page 41) 350mA 350mA/700mA
Figure 2-1B: Spectra 1758 and 1758EX Control Panel Overview
Other than the location of the parts on the board and the items that have been indicated below, connections to these
control panels are identical to those on page 7.
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