Download TR41.9.2-04-05-010-Intentional-protective

TR41.9.2-04-05-010
STANDARDS PROJECT:
TR41.9.2 – Update TSB31-C Section 8.10 for Intentional paths
to ground – Connections with protection paths to ground - TIA
968-A Section 4.4.5.2.
TITLE:
Proposal to update TSB31-C Section 9.6 for Intentional paths to
ground – Connections with protection paths to ground - TIA 968A Section 4.4.5.2.
ISSUES ADDRESSED:
Update TSB31-C Section 9.6 for Intentional paths to ground –
Connections with protection paths to ground - TIA 968-A Section
4.4.5.2.
SOURCE:
Siemens ICN
CONTACT:
Tailey Tung
Phone: 408-492-5049
Fax:
408-492-2563
Email: [email protected]
DATE:
February 23, 2004.
DISTRIBUTION TO:
TIA TR41.9.2
KEYWORDS:
TSB31-C Section 8.10 test procedures
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This document has been prepared by Siemens ICN to assist the TIA Engineering Committee. It is
proposed to the Committee as a basis for discussion and is not to be construed as a binding
proposal on Siemens ICN. Siemens ICN specifically reserves the right to amend or modify the
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8.10 Intentional Protective Paths to Ground ANSI/TIA-968-A, 4.4.5.2
8.10.
Background
Products which have intentional DC conducting paths to ground for protection purposes may fail
the leakage current limitations of ANSI/TIA-968-A, 4.3. The leakage current test of Section 7
allows these paths to be opened (or component removed). To ensure that these network
connections do not present a hazard to network personnel, the components are re-installed, and
a leakage current test is performed at a lower voltage representative of an AC power fault.
8.10.
Purpose
To verify that protective devices do not provide a path for harmful leakage currents at AC power
voltages.
8.10.
Equipment
(1)
Variable AC voltage source SEL# 43 (for TE) or SEL# 44 (for PC).
(2)
AC current meter SEL# 42.
NOTE: Refer to Section 5.3 for equipment details.
8.10.
Equipment States Subject to Test
Simplexed telephone connections, including tip and ring, tip1, ring1, E&M leads, and auxiliary
leads.
8.10.
Procedure
WARNING! ADEQUATE SAFETY PRECAUTIONS SHOULD BE OBSERVED!
(1)
Re-install any protective devices removed for the leakage tests (See Section 7).
(2)
Connect the EUT to the test circuit of Figure 8.10-1.
(3)
Select the appropriate EUT test points.
(4)
Gradually increase the voltage from zero to 120 VRMS (for TE) or 300 VRMS (for PC).
Maintain the maximum voltage for one minute.
(5)
Monitor the current through the AC ammeter. The current must not exceed 10 mA peak at
any time.
8.10.
Alternative Methods
None suggested.
8.10.
Suggested Test Data
(1)
List of leads tested.
(2)
List of maximum current measured for each combination.
8.10.
(1)
Comments
This test is to be applied to leads excluded from the requirements of ANSI/TIA-968-A, 4.4.5.1
that contain only intentional protective paths to ground. An EUT which has both intentional
operational and intentional protective paths to ground needs to meet only the requirements of
ANSI/TIA-968-A, 4.4.5.1 referred to in section 8.9 of this document
Refer to ANSI/TIA-968-A, 4.4.3 for the definition of a non-hazardous voltage source and
ANSI/TIA-968-A, 4.3 Note (1).
Figure 8.10-1 Intentional Protective Paths to Ground