Toshiba DK 16 Grounding Requirements, Electrical/Environmental Requirements and Characteristics

INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

DK16 BASE AND EXPANSION

UNIT CLEARANCE

FRONT VIEW
	2"	20"	2"
				2"

EXP BASE 18"

2"

TOP VIEW

EXP	BASE	3.5"
		WALL

3 FEET

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.

3.02The 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

3.03If 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.

3.10Electrical/Environmental Requirements and Characteristics

3.11The electrical/environmental requirements and characteristics for each system are provided in Table 2-A.

4GROUNDING REQUIREMENTS

4.00The 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)

4.10Third Wire Ground Test

4.11Test 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.

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