Toshiba Strata VI Installation Instructions Manual page 9

SECTION 100-006-200
INSTALLATION INSTRUCTIONS
DECEMBER 1982
06.24 For protection against static
electricity, a green jumper wire is
attached to the
11
FG
11
screw (refer to
Figure 8). This wire must be connec-
ted to the
11
0V
11
terminal on the MTOU
power strip. Reinstall the plastic pro-
tective cover on the power strip at
this time.
06.25
The Toshiba STRATA VI elec-
tronic key telephone system requires a
solid earth ground on the
11
FG
11
terminal
on the MKSU tray. Failure to provide
such a ground may lead to confusing
trouble symptoms in the system and, in
extreme cases, circuit board failure.
e In most installations, within the
continental United States, the
ground provided by the
11
third wire
ground
11
at the commercial power
outlet will be satisfactory for all
STRATA VI requirements. llow-
ever, in a small percentage of in-
stallations this ground may be
installed incorrectly. Therefore,
prior to installing a STRATA VI
system, the third wire ground must
be tested for continuity by either
measuring the resistance between
the 3rd prong terminal (earth
ground) and a metal cold water
pipe, or by using
11
commercially
available emth
f~round
indicntor.
lf neither of these procedures are
possible, then the test procedures
outlined in Parngrnph 06.26 should
be performed.
CAUTION:
Hazardous voltage is exposed
during the following test.
Use great care when working
with AC powerline voltage.
06.26 Test Procedure
1.
Obtain a suitable voltmeter and set
it for a possible reading of up to
250VAC.
2. Connect the meter probes between
- 6 -
the two main AC voltage points on
the wall outlet. The reading ob-
tained should
be
90"-'l30VAC.
3. Move one of the meter probes to
the 3rd prong terminal (GND).
Either the same reading or a
reading of 0 volts should be ob-
tained.
4. If the reading is OV, leave one
probe on the GND terminal and
move the other probe to the 2nd
voltage terminal. If a reading of
OV is obtained on both voltage
terminals, the outlet is not pro-
perly grounded. Omit Steps 5 /'./ 7,
and proceed directly to Step 8.
5. If a reading of OV on one terminal
and a reading of 90
~
130VAC on
the other terminal is not obtained,
the outlet is not properly groun-
ded. Omit Steps 6 &: 7, and pro-
ceed directly to Step 8.
6. If a reading of OV on one terminal
and a reading of 90/\/130VAC on
the other terminal is obtained, re-
move both probes from the outlet.
7. Set the meter on the noHMS/Rxir'
scale, place one probe on the G ND
terminal and the other probe on
the terminal which gave a reading
of OV. A reading of less than one
ohm should be obtained. If a
reading of less the one ohm is not
obtained, the outlet is not ade-
quately grounded.
8.
If
the above tests show that the
outlet is not properly grounded,
that condition should be corrected
(per Article 250 of the National
Electrical Code) by a qualified
electrician before the STRATA VI
system is conn(~cted.
06.27
Ensure that the power switch
on the MTOU is OFF, then plug the
power supply into the 115VAC outlet