3-3
INSTALLATION-SITE REQUIREMENTS
SECTION 400-096-203
SEPTEMBER 1992
water pipe or the building ground (Figure 3-3) to
further insure the presence of ground.
NOTES:
1. The “third wire ground” must be dedi-
cated.
2. The conductor connected to the frame
ground must comply with the general
rules for grounding contained in Article
250 of the National Electrical Code, NFPA
70, but must not depend on the cord and
plug of the system.
5.10 Third Wire Ground Test
5.11 Test the "third wire ground" for continuity by
either measuring the resistance between the third
prong terminal (earth ground) and a metal cold
water pipe (maximum: 5 ohms), or by using a
4 CABLE LENGTHS/NETWORK
REQUIREMENTS
4.00 Tables 3-B and 3-C list station loop require-
ments and system network requirements, respec-
tively. The key service unit (KSU) must be located
to allow compliance with the specified require-
ments.
5 GROUNDING REQUIREMENTS
5.00 The system requires a solid earth ground for
proper operation. Failure to provide ground may
lead to confusing trouble symptoms and, in ex-
treme cases, system failure. The AC power cord
already contains a conductor for the "third wire
ground" provided by the commercial power outlet;
but connect a conductor between the frame ground
terminal on the key service unit (KSU) and a cold
NOTES:
1. Some distance limitations apply. See Table 9-D.
2. Requires 3-pair to receive Off-hook Call Announce calls.
3. Approximately 3000 feet (909 m) with 150 ohm device. See manufacturer’s product specifications
for exact resistance of device.
Device
Max Loop Resistance
(Including Device)
Max Distance from
KSU to Device
Number of
Wire Pairs
PCB
Interface
Digital Telephone
DDSS Console
DDCB
PDIU-DS
PDIU-DI or PDIU-DI2
Electronic Telephone
HDSS Console
HDCB
Standard Telephones,
Voice Mail, Fax
Machine
PDKU
PDKU
PDKU
PDKU
PDKU
PEKU, PESU
PEKU
PEKU, PESU
PSTU, PESU
40 ohms
40 ohms
40 ohms
40 ohms
40 ohms
40 ohms
20 ohms
40 ohms
300 ohms
1000 feet (303 m)
1000 feet (303 m)
1000 feet (303 m)
1000 feet (303 m)
1000 feet (303 m)
1000 feet (303 m)
500 feet (152 m)
1000 feet (303 m)
see Note 3
1
1
1
1
1
1
1
1
1
1
2
2
2
2
1
TABLE 3-B
LOOP REQUIREMENTS
Summary of Contents for Strata DK 24
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