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Basic Insulation Winding Wire “FSX-E”
and Supplementary Insulation Winding Wire “FWX-E”

1.

INTRODUCTION

The Internet that became popular among common people
since around 1990 has promoted networking of not only
information and communications equipment but also electro-electronic equipment in general. Thus recent years
have seen forthcoming of new home appliances called“networking home appliances”. These new appliances
require new safety standards since they are connected totelecommunications networks while they are fed power
through electric power lines.
Heretofore, standards for telecommunications networks
have been established according to the Telecommunications Business Law domestically and to theITU Telecommunication Standardization Sector (ITU-T)
and the like internationally. There are also safety standards for electro-electronic equipment laid down by theInternational Electrotechnical Commission (IEC), among
which IEC 60950 “Safety of Information TechnologyEquipment” is known as a representative one. Further,
Clause 6 of Amendment 3 of IEC 60950 2nd issued in
1995: “Connection to Telecommunication Networks” is thevery standard specifying the safety of these electro-electronic equipment. To be more specific, the safety standard
requires that there must be an insulation equivalent or
superior to the Basic Insulation, between the TNV circuit -standing for Telecommunication Network Voltage-- of thecommunication side and the SELV circuit --standing for
Safety Extra-Low Voltage-- of the electro-electronic equipment side, all being specified by the standard. In particular, since UL appointed in UL 1950 the effective date of
the new safety requirement to be April 1, 2000, this safety
requirement became widespread rapidly.
Meanwhile, the electro-electronic equipment together
with the IT equipment belong to the area where things are
remarkably shifting to lighter, thinner, shorter and smaller
products in addition to efficiency enhancement and cost
reduction. In such a situation, the new safety standard
requires a small transformer of about 10-mm square -provided between TNV and SELV, and known by thename of TNV transformer-- to be insulated, thereby posing
a serious problem in terms of its implementation, productivity degradation and cost increase.
Against this background, Furukawa Electric has developed and marketed a basic insulation winding wire “FSXE” and a supplementary insulation winding wire “FWX-E”

in response to the new market requirements. The wires
are based on the marketing expertise the company has
acquired by the development of triple insulated winding
wire with built-in reinforced insulation “TEX-E” and its
series products, which were brought into the market placein January 1993.

2.

FEATURES

FSX-E and FWX-E are fine insulated winding wires withthe built-in Basic Insulation and Supplementary Insulation
specified in IEC 60950, respectively. Their main applications are TNV transformers. Use of FSX-E or FWX-E eliminates interleaved insulation tape and barrier required to
be provided between the primary and secondary circuits,
thereby contributing to downsizing of transformers as wellas cost reduction through efficiency enhancement andModified polyester insulation

UEW wire (Polyurethane enamelled copper wire)

Figure 1

Construction of FSX-E.

Polyamide insulation
Modified polyesterinsulation

UEW wire (Polyurethane enamelled copper wire)

Figure 2

Construction of FWX-E.

Furukawa Review, No. 23

2003

115

Basic Insulation Winding Wire “FSX-E” and Supplementary Insulation Winding Wire “FWX-E”

Table 1

Safety standards certifying FSX-E.

Certification body

Approval No.

UL

E206440 (OBJT2)

CSA

185274VDE

Nr.123079

Insulation grade

Basic insulation

ADSL

Table 2
Certification body

Safety standards certifying FWX-E.
Approval No.

Insulation grade

UL

E206440 (OBJT2)

CSA

185274

SupplementaryVDE

Nr.139405

insulation

NEMKO

P01102314

VoIP router

DSLAM

productivity upgrading. They also contribute to the designof environment-friendly transformers by reducing the number of parts enabling ease of disassembly.
Below will be described their constructions and features.

3.

2.1 Construction of Wire
FSX-E and FWX-E are fine insulated winding wires with aconstruction where modified polyester and/or polyamide
resins --proprietary products developed by Furukawa
Electric-- are uniformly extruded with a thickness of about
30 µm per layer to provide insulation on polyurethane
enamelled (UEW) copper wires 0.11~0.19 mm in diameter. See Figures 1 and 2.
The thermal resistance of the wires themselves is ClassE, 120°C.
The manufacturable sizes are as follows:
FSX-E: 0.11~0.15 mm
FWX-E: 0.11~0.19 mm

Basic insulation winding wire “FSX-E” and supplementary
insulation winding wire “FWX-E” are insulated winding
wires for insulated transformers in telecommunications
equipment, being in conformity to international safety
standards. They have been developed through the integration of Furukawa Electric’s proprietary technologies ofthermal-resistant insulation resin and uniform thin-thickness extrusion over fine wires.
We are committed to further offering of new productsthat meet market needs and are in compliance with international safety standards, including TEX-E, TEX-B andTEX-F --reinforced insulation wires commonly known as
triple insulated winding wires.

2.2 Obtained Safety Certification
FSX-E and FWX-E pass the withstand-voltage test of1500 Vrms for 1 min stipulated in Sub-Clause 2.10.5.4 andAnex U of IEC 60950 3rd, and are usable in insulatedtransformers with an operating voltage of 354 Vpeak or DC.
The wires have received approval from certification bodies
as shown in Tables 1 and 2.

For more information, please contact:
TEX Sec., Opto-Electronics Sales Dept., MarketingDiv.
TEL: +81-3-3286-3144
FAX: +81-3-3286-3029
2nd Engineering Gr., Engineering Dept., Winding
Wire Div.
TEL: +81-463-21-8243
FAX: +81-463-21-8244
or visit our website at:
http://www.FSX-E.com
http://www.TEX-E.com

2.3 Solderability
FSX-E and FWX-E are directly solderable using a condition of about 420°C for 2 sec without removing the insulation.

Photo 1

Application examples.

IN CONCLUSION

2.4 Typical Applications
FSX-E and FWX-E can be used in insulated transformers
for such IT equipment as ADSL, DSLAM and VoIP router,
where basic insulation or supplementary insulation isneeded. See Photo 1.

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