Electrical/Environmental Requirements And Characteristics; Grounding Requirements; Third Wire Ground Test; Requirements - Toshiba Strata DK 16 Installation And Maintenance Manual

INSTALLATION-SITE REQUIREMENTS
SECTION 100-816-202
MARCH 1993
DK16 BASE AND EXPANSION
UNIT CLEARANCE
FRONT VIEW
20"
2"
EXP
TOP VIEW
EXP
FIGURE 2-3
DK16 COMBINED BASE AND
EXPANSION KEY SERVICE UNIT
MINIMUM CLEARANCE REQUIREMENTS
and optioned STRATA DK16 system. Refer to
Chapter 4 for DK16 key service unit wall mounting
instructions.
3.02 The following conditions must be considered
when selecting a location for the key service unit(s):
The location MUST BE:
•
Dry and clean
•
Well ventilated
•
Well illuminated
•
Easily accessible
The location MUST NOT BE:
•
Subject to extreme heat or cold
•
Subject to corrosive fumes, dust, or other air-
borne contaminants
•
Subject to excessive vibration
•
Next to television, radio, office automation, or
high frequency equipment
2"
2"
BASE
18"
2"
BASE 3.5"
WALL
3.03 If reserve power is to be installed for the
STRATA DK16, the batteries will require a well-
ventilated location close (within nine feet) to the
DKSUB16 (the optional Toshiba-supplied battery
cable is 9 feet in length). The STRATA DK8
reserve battery (HPFB) should be mounted di-
rectly above the DKSU8 as shown in Figure 2-1.
3.10 Electrical/Environmental Requirements
and Characteristics
3.11 The electrical/environmental requirements
and characteristics for each system are provided
in Table 2-A.

4 GROUNDING REQUIREMENTS

4.00 The systems require 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
contains a conductor for the "third wire ground"
provided by the commercial power outlet. The
third-wire ground should be the only ground nec-
essary for the DK8/DK16; this ground must origi-
nate at the buildings main power distribution panel
and have a solid connection to earth ground.
(Figure 2-4)

4.10 Third Wire Ground Test

4.11 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: 1 ohm), or by using a
commercially available earth ground indicator. If
neither procedure is possible, perform the follow-
ing earth ground test procedure:
WARNING!
Hazardous voltages that may cause death
or injury are exposed during the following
test. Use great care when working with AC
power line voltage.
1) Obtain a suitable voltmeter, and set it for a
possible reading of up to 250 VAC.
2-2