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1、照明开关为何必须接在火线上?
如果将照明开关装设在零线上,虽然断开时电灯也不亮,但灯头的相线仍然是接通的,而人们以为灯不亮,就会错误地认为是处于断电状态。而实际上灯具上各点的对地电压仍是220伏的危险电压。如果灯灭时人们触及这些实际上带电的部位,就会造成触电事故。所以各种照明开关或单相小容量用电设备的开关,只有串接在火线上,才能确保安全。
2、单相三孔插座如何安装才正确?为什么?
通常,单相用电设备,特别是移动式用电设备,都应使用三芯插头和与之配套的三孔插座。三孔插座上有专用的保护接零(地)插孔,在采用接零保护时,有人常常仅在插座底内将此孔接线桩头与引入插座内的那根零线直接相连,这是极为危险的。因为万一电源的零线断开,或者电源的火(相)线、零线接反,其外壳等金属部分也将带上与电源相同的电压,这就会导致触电。
因此,接线时专用接地插孔应与专用的保护接地线相连。采用接零保护时,接零线应从电源端专门引来,而不应就近利用引入插座的零线。
3、塑料绝缘导线为什么严禁直接埋在墙内?
(1)塑料绝缘导线长时间使用后,塑料会老化龟裂,绝缘水平大大降低,当线路短时过载或短路时,更易加速绝缘的损坏。
(2)一旦墙体受潮,就会引起大面积漏电,危及人身安全。
(3)塑料绝缘导线直接暗埋,不利于线路检修和保养。
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NAMCO 20-230VAC/DC 0.5A 1500 PSI CYLINDICATOR, EE230-20420, NNB
SMC MAGNETIC REED SWITCH SENSOR D-A93 NNB
DATALOGIC BARCODE READER SCANNER MATRIX 400 600-010 *LENSE COVER*
ORION PERPHECT LOGR METER MODEL 310
FOXBORO I/A SERIES MASS FLOWTUBE CFS10-15SCFBB
NAMCO 2WAC/DC, 20-230VAC/DC, LEAKAGE: 1.7mA FLAT SWITCH EE530-84400
SICK WE2000-B5100 7023083 NIB
MICROSCAN MS-3000 BARCODE READER DECODER FIS-3000-0003 NIB
NAMCO CYLINDICATOR EE520-42521
BANNER PBA PHOTOELECTRIC POWER BLOCK SENSOR 120V-AC
WILCOXON RESEARCH ACCELEROMETER SENSOR 786A
BIO BIC ConSISTENCY SENSOR CS3C
ALLEN BRADLEY GLASS FIBER OPTIC CABLE 99-52-1096 SER C NIB
TEMPOSonIC 37" LINEAR POSITION SENSOR SER R RHM0700MD631P10?2
ENDREE + HAUSER PROMAG 53 / H FLOW MEASURING SYSTEM 53H02-LA0B1RA0B?BAA
IFM EFFECTOR 10-55VDC INDUCTIVE PROXIMITY SENSOR IW5008 IW-3008-ANOG
FOXBORO I/A SERIES TEMPATURE TRANSMITTER BO300BT
BANNER MAXI-BEAM SENSOR PHOTELECTRIC RECIEVER HEAD RSBR
SICK * 30-MGS SAFETY LIGHT CURTAIN * MGSS45-12
SMC WIRED MAGNETIC REED SWITCH D-A93 1.6M
AIRPAX 12VDC HALL-EFFECT SENSOR, 087-304-0070
SICK 55-350MM OPTIC SENSOR UC12-12231 / 6029832
HonEYWELL * PROXIMITY SENSOR * T18-A118
DELPHI OXYGEN SENSOR ES10173 NIB
IFM ELECTRonIC PRESSURE SENSOR PB4213
DELPHI OXYGEN SENSOR ES10171 NIB
SMC * REED WITCH PROXIMITY SENSOR * D-A73C
TEMPERATURE SENSOR 219-41375-00A
EC PROXIMITY SENSOR 724688 C
SITRANS MAGFLO FLOWMETER ELECTROMAGNETIC FLOW SENSOR MAG 3100
IFM EFECTOR100 20-250VAC/VDC 350MA INDUCTIVE SENSOR, II0272 IIA2010-ABOA
NAMCO 10-30VDC @200mA 300PSI PROXIMITY SWITCH CYLINDICATOR EE210-61304
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DELPHI PS10016 EMISSION SENSOR, NIB
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SOLARTRON 300VAC LINEAR DISPLACEMENT TRANSDUCERS M920886A647-01 105128
NAMCO 20-230VAC/DC 0.5A 1500 PSI CYLINDICATOR, EE230-20420, NIB
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WATLOW G262024503 THERMOCOUPLE, NNB
IFM EFECTOR OP0019 / OPR-FB0W RETRO-REFLECTIV?E SENSOR, NIB
ALLEN BRADLEY * 20-250VAC 300MA PROXIMITY SENSOR NIB * 872C
MARPOSS * SENSOR NIB * 2014037021
STI MINISAFE LONG RANGE MS4400 SERIES 43531-0360 MS4436R
BALLUFF * PROXIMITY SENSOR * BES 516-538-B0-H-PU
IFM EFECTOR INDUCTIVE SENSOR IG554 IGA3005-BPKG/US
BIO BIC 110/220V ConSISTENCY SENSOR CS2C
IFM ELECTRonIC IIM0042 IMC2035-ARKA-LS 140 VOLTS 45-65 HERTZ PROXIMITY SWITCH
SIDEL 12-24VDC PROXIMITY SENSOR 00000108868
IFM ELECTRonIC 18-30VDC 300 BAR MAX PRESSURE SENSOR PN5022
BANNER PHOTOELECTRIC SENSOR PBAT
IFM, PHOTOELECTRIC SENSOR, OJ036
KEYENCE FIBER OPTIC SENSOR FS-V11
REGAL JOINT CO. 24VDC FLOW SENSOR W/ base, FS-30AR
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SIEBE FOXBORO POLARITY SENSOR 0042 REV C 105399
OMRON PHOTO ELECTRIC SWITCH E32-D12R NIB
EATON CUTLER-HAMMER E57LAL30A2 20-250 VAC INDUCTIVE PROXIMITY SENSOR, NNB
INSERTION PROBE C5000 102913
BANNER MULTI-BEAM PHOTOELECTRIC BEAM SENSOR 17562 NIB
NAMCO EE510-88040 PXSW FLATPAK PROXIMITY SWITCH
ROCKWELL AUTOMATION ALLEN-BRADLEY SENSORS REFERANCE EDITION CATALOG
TURCK CYLINDER PROXIMITY SENSOR SWITCH B12-CRS524
BLH ELECTRonICS KIS-1 BEAM WEIGH MODULES, NIB
SMC * AUTO SENSOR CABLE * D-B54
NAMCO EE510-91440 SENSOR
DELPHI OXYGEN SENSOR ES10213 NIB
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DELPHI OXYGEN SENSOR ES10391 NIB
DELPHI OXYGEN SENSOR ES10191 NIB
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DELPHI OXYGEN SENSOR ES10609 NIB
DELPHI OXYGEN SENSOR ES10009 NIB
DELPHI OXYGEN SENSOR ES10570 NIB
DELPHI OXYGEN SENSOR ES10157 NIB
DELPHI OXYGEN SENSOR ES10107 NIB
DELPHI OXYGEN SENSOR ES10357 NIB
DELPHI OXYGEN SENSOR ES10211 NIB
DELPHI OXYGEN SENSOR ES10656 NIB
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TELEMECANIQUE PROXIMITY SWITCH SENSOR XSAV12801
DELPHI OXYGEN SENSOR ES10249 NIB
DELPHI OXYGEN SENSOR ES10572 NIB
DELPHI OXYGEN SENSOR ES10569 NIB
DELPHI OXYGEN SENSOR ES10144 NIB
DELPHI OXYGEN SENSOR ES10370 NIB
DELPHI OXYGEN SENSOR ES10192 NIB
DELPHI OXYGEN SENSOR ES10250 NIB
DELPHI OXYGEN SENSOR ES10183 NIB
DELPHI OXYGEN SENSOR ES10207 NIB
DELPHI OXYGEN SENSOR ES10103 NIB
DELPHI OXYGEN SENSOR ES10367 NIB
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