
2SHUDWLQJ LQVWUXFWLRQV
80
9
&*&
6HWWLQJV IRU XQGHUYROWDJH SURWHFWLRQ DGGUHVV EORFN
8 1 ' ( 5 9 2 / 7 $ * (
%HJLQQLQJ RI WKH EORFN k8QGHUYROWDJH SURWHFWLRQl
8 1 ' ( 5 9 2 / 7
2 ) )
6ZLWFK
2))
RI WKH XQGHUYROWDJH SURWHFWLRQ
6ZLWFK
21
RI WKH XQGHUYROWDJH SURWHFWLRQ
8QGHUYROWDJH SURWHFWLRQ RSHUDWHV EXW
75,3
5(/
D\ LV
%/2&.
HG
2 1
% / 2 & . 7 5 , 3
5 ( /
7KH XQGHUYROWDJH SURWHFWLRQ KDV D YROWDJH GHSHQ
GHQW WLPH FKDUDFWHULVWLF 7KH XQGHUYROWDJH SURWHF
WLRQ PDLQO\ SURWHFWV FRQVXPHUV LQGXFWLRQ PD
FKLQHV IURP WKH FRQVHTXHQFHV RI YROWDJH GURSV LQ
LVODQG QHWZRUNV $OVR LQ LQWHUFRQQHFWHG QHWZRUNV LW
FDQ EH XVHG DV D ORDG VKHGGLQJ FULWHULRQ
'HSHQGLQJ RQ WKH W\SH RI WKH PDFKLQH DQG WKH QHW
ZRUN GLIIHUHQW SRLQWV QHHG WR EH FRQVLGHUHG ZKHQ
VHWWLQJ WKH SDUDPHWHUV
,Q WKH FDVH RI DV\QFKURQRXV PDFKLQHV WKH SXOORXW
WRUTXH LV QRUPDOO\ WR WLPHV WKH UDWHG WRUTXH ,W
GHFUHDVHV ZLWK WKH VTXDUH RI WKH YROWDJH 7KLV
PHDQV WKDW WKH PDFKLQH ZLOO VWDOO DW WR
UDWHG YRZHYHU DV\QFKURQRXV PRWRUV FDQ
UXQ XS DJDLQ DIWHU UHFRYHU\ RI D VXIILFLHQWO\ KLJK YROW
DJH DOEHLW ZLWK LQFUHDVHG VWDUWLQJ FXUUHQW
7KH VHWWLQJ IRU WKH YROWDJH OLPLW YDOXH VKRXOG WKHUH
IRUH OLH VOLJKWO\ DSSUR[ DERYH WKH UDWLR
UDWHG WRUTXH
SXOO
RXW WRUTXH
¯
ô
8
1
6LQFH WKH DERYH FRQVLGHUDWLRQV DVVXPH UDWHG IUH
TXHQF\ SRZHU YDOXHV FDQ EH LQVHUWHG LQ SODFH RI
WRUTXHV
,Q V\QFKURQRXV PDFKLQHV WKH WRUTXH GHFUHDVHV OLQ
HDUO\ ZLWK WKH YRZHYHU V\QFKURQRXV PD
FKLQHV DUH PRUH VHQVLWLYH ZLWK UHJDUG WR YROWDJH GH
FUHDVHV VLQFH WKH\ FRQWUDU\ WR DV\QFKURQRXV PD
FKLQHV IDOO RXWRIVWHS LI WKH SXOORXW WRUTXH KDV
EHHQ UHDFKHG 7KHUHIRUH WKH VDIHW\ PDUJLQ VKRXOG
EH VOLJKWO\ KLJKHU $OVR LQ WKLV FDVH WKH YROWDJH
VKRXOG QRW GURS EHORZ WR RI UDWHG YROWDJH
)RU WKH VHWWLQJ RI WKH YROWDJH OLPLW YDOXH D YDOXH
HTXDO WR DERYH WKH UDWLR
UDWHG WRUTXH
SXOORXW WRUTXH
k
8
1
LV UHFRPPHQGHG 3RZHU YDOXHV FDQ EH LQVHUWHG LQ
VWHDG RI WRUTXHV
,I WKH SHUPLVVLEOH YROWDJH WLPH FKDUDFWHULVWLF RI WKH
PDFKLQH LV VWDWHG E\ WKH PDQXIDFWXUHU WKLV VKRXOG
EH WDNHQ DV WKH EDVH IRU WKH VHWWLQJV
7KH FKDUDFWHULVWLF FDQ EH HQWHUHG WR WKH SURWHFWLRQ
E\ VHWWLQJ SDLUV RI WKH YROWDJH WLPH FKDUDFWHULVWLF
7KXV HDFK VRUW RI FXUYH FDQ EH DFKLHYHG 7KH
SDLUV RI YDOXHV FDQ EH UHDG RXW IURP WKH YROWDJH WLPH
FKDUDFWHULVWLF RI WKH PDFKLQH DQG SDUDPHWHUL]HG XQ
GHU WKH DGGUHVVHV WR
6WDUW ZLWK WKH YDOXH IRU WKH KLJKHVW YROWDJH XQGHU DG
GUHVV WKH DVVRFLDWHG WLPH LV VHW XQGHU DG
GUHVV &RQWLQXH ZLWK IXUWKHU YDOXH SDLUV
ZKLFK PXVW EH GHFUHDVLQJ YROWDJH YDOXHV DQG GH
FUHDVLQJ DVVRFLDWHG WLPHV 7KXV HDFK XVHU GHILQHG
FKDUDFWHULVWLF FDQ EH DFKLHYHG 7LPH GHOD\V EH
WZHHQ WKH VHW YROWDJH YDOXHV ZLOO EH OLQHDUO\ LQWHUSR
ODWHG E\ WKH SURWHFWLRQ
1RWH WKDW DOO VHWWLQJ WLPHV DUH DGGLWLRQDO GHOD\ WLPHV
ZKLFK GR QRW LQFOXGH WKH QRUPDO RSHUDWLQJ WLPHV
PHDVXULQJ WLPH UHVHW WLPH RI WKH SURWHFWLRQ IXQF
WLRQ LWVHOI 7KLV VKRXOG DOVR EH FRQVLGHUHG ZKHQ VHW
WLQJ WKH WLPHV
1RWH
,I DOO GHOD\ WLPHV VKRXOG EH HTXDO LH WKH GHOD\
VKRXOG EH GHILQLWH WLPH QHYHUWKHOHVV VL[ GLIIHUHQW
YROWDJH YDOXHV PXVW EH HQWHUHG LQ DQ GHFUHDVLQJ RU
GHU
www
. ElectricalPartManuals
. com