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National Differences
Clause
Requirement
−
Test
Result – Remark
Verdict
US National Differences according to CB Bulletin No. 107A, May 2004
2.3.1
For TNV-2 and TNV-3 circuits with other than
ringing signals and with voltages exceeding
42.4 Vpeak or 60 Vd.c., the maximum acceptable
current through a 2000 ohm resistor (or greater)
connected across the voltage source with other
loads disconnected is 7.1 mA peak or 30 mA d.c.
under normal operating conditions.
No TNV circuits.
N
2.3.2
In the event of a single fault, the limits of 2.2.3
apply to SELV Circuits and accessible conductive
parts.
No TNV circuits.
N
2.6.3.3
When subject to impedance testing, protective
earthing and bonding are required to be subjected
to the additional test conditions specified.
Class II equipment.
N
3.2.1.2
Equipment connected to a centralized d.c. power
system, and having one pole of the DC mains
input terminal connected to the main protective
earthing terminal in the equipment, is required to
comply with special earthing, writing, marking and
installation instruction requirements.
Not applicable for this
equipment.
N
4.2.8.1
Enclosures around CRTs with a face diameter of
160mm or more are required to reduce the risk of
injury due to the implosion of the CRT.
Not applicable for this
equipment.
N
4.3.2
Equipment with handles is required to comply with
special loading tests.
No handle.
P
5.1.8.3
Equipment intended to receive telecommunication
ringing signals is required to comply with a special
touch current measurement tests.
No TNV circuits.
N
6.2.1
Enamel coating on winding wire not considered
electrical separation unless subjected to special
investigation.
No TNV circuits.
N
6.4
Equipment intended for connection to
telecommunication network outside plant cable is
required to be protected against overvoltage from
power line crosses in accordance with 6.4 and
Annex NAC.
No TNV circuits.
N
6.5
Equipment connected to a telecommunications
network and supplied with an earphone intended
to be held against, or in the ear is required to
comply with special acoustic pressure tests.
No TNV circuits.
N
M.2
Continuous ringing signals up to 16 mA only are
permitted if the equipment is subjected to special
installation and performance restrictions.
No TNV circuits.
N
