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Industrial Control Transformers
Frequently Asked Questions
59
08/2005
© 1999–2005 Schneider Electric All Rights Reserved
What does the CE VA rating mean in
selecting a 9070 Type T control transformer?
The CE mark is the official marking required by the European Community for all Electric and Electronic equipment that
will be sold, or put into service for the first time, anywhere in the European community. CE VA is the rated capacity of
the control transformer according to the CE standard. By bearing the CE marking, a transformer can be sold into any
of the participating European countries without having to first clear with that country whether it will accept the UL
rating.
An installer had been told by an electrical
engineer to ground a 9070 Type T control
transformer’s frame to the enclosure with a
star washer. If this is so important, why does
Schneider Electric plate the base of the
transformer?
The 9070s base is plated to keep it from rusting. Schneider Electric does not provide grounding provisions on
transformer, as grounding is the responsibility of the installer per NEC requirements.
Does a Schneider Electric 9070 Type T or TF
industrial control transformer have any
continuous overload capacity? What about
momentary overloads due to high inrush
loads, such as may occur with a coil on a
contactor?
Transformers are 100% rated devices. As such, they do not have any continuous overload capacity. They are
specifically designed for momentary currrent draw in excess of their rating for high inrush type loads.
Does a 9070 Type T or TF transformer need
to have its impedance listed on its nameplate
to be used in any particular area in the world?
Industrial control transformers do not have to list their impedance on their nameplate. They can be used anywhere in
the world where their UL, CSA, or CE listing allows, or where they are allowed by the local jurisdiction.
What is the difference between a 9070 Type
T and Type EO control power transformer?
The 9070 Type T is the current design and has both factory and field installed accessories available (such as fuse
blocks, fingersafe covers, fuse pullers, etc.). The Type EO is an established design with better regulation, but does not
have any available accessories.
What is the difference between an old 9070
Type K transformer and a new 9070 Type T?
The CE rated, NOM approved Type T transformer replaces the Type K, which is no longer available. The Type T
matches the Type K in function and form, but not necessarily in fit, i.e., the dimensions may vary.
Does Schneider Electric offer finger safe
covers for use with 9070 Type T and TF
transformer fuse blocks?
The fuse puller accessories (9070FP1) do offer some protection when used and the fuse is in place, however they do
not qualify the block for any additional standards. While the fuse block is CE marked, the fuse puller kit does not
comply with European standards for finger safe as it does not require a tool to remove it. However, this may not be
critical as Schneider Electric does not recommend shipping our fuse block or 9070TF to Europe, as the fuses used
there are different than those used in North America. Thus, the customer should supply their own fuse block suitable
for the European fuses when the transformer is to be used in Europe.
Can a 9070 Type T control power transformer
or a general purpose transformer be used to
provide power for 24V lighting, 120V to 24V
application?
The NEC requires the transformer feeding the low voltage lighting system to be a part of the UL listed lighting system
as assembled by the Original Equipment Manufacturer (OEM). A contractor, distributor, or end user cannot assemble
their own low voltage lighting system and comply with the NEC without going through UL. If the OEM has a particular
transformer listed in their UL file, then that unit may be used.
So if the Schneider Electric 9070 Type T device is part of a lighting system that is UL listed, the answer is yes.
Question Answer