Operation
21 Safe isolation from supply and correct terminal-phase connections
7KH SDQHOV DUH HTXLSSHG ZLWK WHVW VRFNHWV IRU
FRQQHFWLRQ RI YROWDJH LQGLFDWLRQ V\VWHPV
7HVW VRFNHW V\PERO
Fig. 34:
Danger!
,I VDIH LVRODWLRQ IURP VXSSO\ LV QRW YHULILHG FRUUHFWO\
'DQJHU
Õ
&KHFN WKH SHUIHFW XQFWLRQ RI WKH YROWDJH LQGLFDWRU
DQG WKH FRXSOLQJ VHFWLRQ
q RQ OLYH HTXLSPHQW
q ZLWK WHVW XQLW DFFRUGLQJ WR
q RQ DOO SKDVHV
21.1 Verification of safe isolation from supply
Õ
5HPRYH WKH FRYHUV IURP WKH FDSDFLWLYH WHVW VRFNHWV
/ / /
Õ
3OXJ WKH YROWDJH LQGLFDWRU LQ DOO WKUHH SKDVHV / /
/ RI WKH WHVW VRFNHWV
,I WKH YROWDJH LQGLFDWRU GRHV QRW IODVK RU OLJKW XS LQ
DQ\ RI WKH WKUHH WHVW VRFNHWV WKH SKDVHV DUH QRW
OLYH
Õ
5HSODFH WKH FRYHUV RQ WKH WHVW VRFNHWV WR SUHYHQW
SROOXWLRQ
,668(
23(5$7,21 '$
'; %$