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參數資料
| 型號： | P3100SARP |
| 英文描述： | SIDAC|350V V(BO) MAX|800MA I(S)|DO-214AA |
| 中文描述： | SIDAC的| 350V五（公報）最大| 800mA的我（縣）|的DO - 214AA |
| 文件頁數： | 103/161頁 |
| 文件大?。?/td> | 986K |
| 代理商： | P3100SARP |
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SIDACtor
Data Book
UL 497
Teccor Electronics
(972) 580-7777
4 - 29
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UL 497 Series of Safety Standards
The UL 497 series is a family of three safety standards which provide requirements for
protection devices used in low voltage circuits.
UL 497
issues requirements for primary protectors used in paired communications
circuits
UL 497A
covers secondary protectors for use in single or multiple pair-type
communications circuits
UL 497B
addresses protectors used in data communication and fire alarm circuits
Overview
The focus of
UL 497
is to ensure that paired communication circuit protectors do not
become a fire or safety hazard. The requirements in
UL 497
cover any protector that is
designed for paired communications circuits and is employed in accordance with
article 800 of the National Electric Code. The protectors covered in
UL 497
include
solid state primary and station protectors. These circuit protectors are intended to
protect equipment, wiring, and service personnel against the effects of excessive
voltage potential and currents in the telephone lines caused by lightning, power cross,
power induction and rises in ground potential.
Construction and Performance
UL 497
is divided into two sections which cover construction and performance.
Table 4-19 lists the content of each section.
Performance Tests
Key performance tests which concern over-voltage protectors are detailed in the
arrestor test section. Specific requirements are:
Breakdown Voltage Measurement -
Arrestors are to be tested in the protector
blocks or panels in which they are intended to be employed. Arrestors are required
to breakdown within ± 25% of the manufacturers specified breakdown rating. In no
case shall the breakdown voltage exceed 750V
PK
when subjected to the strike
voltage test shown in Figure 4-14. At no time during this test will the supply voltage
be increased at a rate greater than 2000Vμs.
Impulse Spark-Over Voltage Measurement -
The arrestor must breakdown at less
than 1000V
PK
when subjected to a single impulse potential. Arrestors are to be
tested in each polarity with a rate of voltage rise of 100V/μs, ± 10%.
Abnormal Operation -
Single pair fuse-less arrestors must be able to simultaneously
carry 30A
RMS
at 480V
RMS
for 15 minutes without becoming a fire hazard. A fire
hazard is determined by mounting the arrestor on a vertical soft wood surface and
covering the unit with cheesecloth. Any charring or burning of the cheesecloth
results in test failure. During this test, although the arrestors may short, they must
not have an impulse spark-over voltage or dc breakdown voltage greater than
1500V
PK
.
Discharge Test
- Protectors must comply with the strike voltage requirements after
being subjected to five successive discharges from a 2μF capacitor charged to
1000V
DC
(Figure 4-15).
Repeated Discharge Test -
The arrestor must continue to breakdown at or below its
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