GEH-1023C Type PK-2 Test Blocks and Plugs
of internal connection is shown in F, Fig.
8.
With
out this connection, loss of revenue is possible due
to inte..-ruption of the recording-instrument read
ing,
i.:
replacement of the cover is long delayed.
Auxiliary contacts (2 and 4, Fig.
3)
are used when
the c u r r e n t coils are to be isolated while being
tested and the current-transformer secondaries are
shorte<i .. This type
of
internal connections is shown
in
B, C, D, and E, Fig.
9.
The jumper (3 , Fig.
3)
is employed to c o n11e c t two of auxiliary contacts
No.2, or <,ne of No.2 and one of No.4, Fig.
3.
This
type of connection is shown inC and D, Fig.
8.
H
the test block is mounted on an insulation
panel, install it on the front of the panel and use the
studs for holding it in place (see Fig. 7).
H
the test
block is mounted on the front of steel panels, pro
ceed in the same manner as for installation on in-
. sulation panels except, the separate mounting screws
furnished for this purpose must be used. Be sure
the insulation tubes are on the studs properly to pro
vide insulation from the steel panel (see Fig.
1).
For semi-flush m o u n t i n g on
1/8
inch steel
panels, a different panel drilling is required, and
the block is mounted on the back of the panel with
the contacts extending through the panel. Use sep
arate mou11tiog screws furnished (see Fig. 2).
Drill the panel, for the size of the test block
and panel mounting
in accordance with the
dimensions shown in
5.
2
3
For ease of wiring and uniformity in testing,
the blocks should be mounted so the long center line
is horizontal on the panel and the auxiliary contacts
and interlocking slots are down.
CONNECTIONS
Each b
1
o c k is essentially a multi -pole jack.
When the cover is removed, the device to be tested
is isolated. When current transformers are used,
the secondaries are short -circuited automatically
by auxiliary contacts (see Fig. 7,
8
and
9).
Fig.
3
Six-Pole Test Block With Jumper
and Auxiliary Contacts
Schematic wiring diagrams are shown in Figs.
10 to 16 inclusive.
c;
,,
\_)
(-=\
�
,,
�'
' �-,
_,
1-\
·-'
,,
(=\
��)
,-,
,_,
;.I
� �
,-,
t:)
C)
2
1
"
+
I"
+
I"
1
I"
_.J..
21"
7"
7"
+
7"
--1--cc
7"
--1-
7"
--1-J"__j_
8
15
..
9
--r- 8
·
32 is
1
6
32
l!
l! sll" l!
l!
s
·
� 16
3i6
13"
16
9"
�·
v�
steel panels
A•1Sf11s
"
insulation panels A•3 �8
Fig.
q
Outline Dimensions of Four-Pole and Six-Pole
Test Blocks
.221" (No 2
drill)
8-
holes, Insulation panels
.221"(Na.2 drill) 12- holes, insulation pone is
�·drill
8-
holes, steel panels.
j
I'Y32'
drill 12-holes, steel panels.
�
-<> $-
-�
·-
--
- - T.
.
�
-
� -$- -$-
V {V- i
��·
f----
2"
dn\1
steel panel only---
�
�
f
- i'
dn\1
steel panels only--
-
-lf
1
I
9"
32
2-holes
--i-
3
2-holes
2
f
'
t
- �64
7"
I
1" 1
I
!
8 '
' I
14 I
I
' � 4-
-$·
--$--· -41--- -$- -$- -$- $- I
Ll
jl
I
I
• '
. 7"
7"
'
7"
'
21"
21"
'
7"
7"
7"
7"
7"
8
--:�
.
.
8
AB
-=-==�-=
16
16
4-pole block front of pone\ mountmg
6-pole block front of panel mounting
Fig.
5
Panel-Drilling Dimensions of Four-Pole and Six- Pole Test Blocks
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