General Purpose Low Voltage Transformers Instruction Bulletin
Storing
ENGLISH
Store the transformer in a clean, dry location until installation. Temperature range for
storage is -50°C to +85°C (-58°F to +185°F).
Preparation
Transformers must be installed and serviced only by qualified personnel in accordance
with NFPA
checklist will help ensure a successful installation.
• Check the nameplate to be sure that the transformer is the correct kVA and voltage
• Verify all markings on the leads and terminals. Ensure that these markings agree
• Make sure that the area of installation is well ventilated. Proper operation requires
• Designate an appropriate wall, column, or other surface for installation. Ensure that
• Verify that sufficient mounting hardware is chosen to support the weight of the
®
70 (NEC®) and any other applicable codes and standards. The following
for the load.
with those on the transformer nameplate.
NOTE: Terminal designations are either printed on the wire leads or identified
by wire marking tape on the leads.
an ambient room temperature not to exceed 40°C (104°F).
NOTE: Encapsulated transformers may be installed outdoors without
additional protection against the weather. These are marked “Type 3R” in the
enclosure field of the nameplate.
enough clearance is allowed for the lifting eye(s) to be in the up position and the
terminal compartment to be at the bottom. Follow clearance requirements printed
on the transformer nameplate.
transformer.
Seismic Qualifications
Seismic qualification of nonstructural components by Schneider Electric is just one link
in the total chain of responsibility required to maximize the probability that the
equipment will be intact and functional after a seismic event. The equipment
manufacturer determines that the equipment will be functional following a seismic
event via shake-table testing programs. The seismic qualification testing results
validate that Schneider Electric equipment will perform the intended function after the
earthquake. However,the foundation and the anchorage system must also meet the
applicable building codes and standards for the entire installation to maintain post
earthquake functionality. Equipment inadequately mounted or mounted to weak or
flexible foundations will not meet the requirements.
The equipment specifier/installer determines that the equipment is rigidly supported
and will not leave its foundation during a seismic event. During an earthquake, the
equipment must be able to transfer the loads that are created through the mounting
pad and anchorage to the load-bearing path of the building structural system. If the
equipment is not attached to the building structure in accordance with the minimum
standards recommended herein, the complete equipment installation might become
too flexible and may overturn or shear the attachment devices and slide off its
foundation.
The structural civil engineer or design engineer of record is responsible for detailing the
equipment connection and anchorage requirements (including the lateral restraint
system if appropriate) for the given installation. The installer and manufacturers of the
anchorage and lateral restraint system are responsible for ensuring that the mounting
requirements are met. Schneider Electric is not responsible for the specification and
performance of these anchorage systems.
2 Rev. 00, 39000-243-01© 2000–2018 Schneider Electric All Rights Reserved
Instruction Bulletin General Purpose Low Voltage Transformers
Drawings are available that include specific mounting information for seismic
qualifications. Contact your local Schneider Electric representative, or call
1-888-Square D (1-888-778-2733) to obtain these drawings.
Installation
Enclosure Temperature
NEMA Type 4X Units
1. Mount the transformer.
2. Connect the transformer primary according to the wiring diagram on the
nameplate. For field connections, use wire rated for a minimum 90°C (194°F)
and sized for 75°C (167°F) ampacity.
3. Ground the enclosure permanently a nd adequately in accordance with National
Electrical Code requirements. The separately derived secondary system may
require grounding. Refer to Section 250.20(D) of NFPA 70 (2008).
4. Energize the unit, and check the seconda ry voltage to be sure it is proper for
the load.
NOTE: Measured voltage may be slightly higher than nominal because of
compensated windings on transformers 3 kVA and below.
5. Shut off the primary supply.
6. Test with a properly rated voltage sensing device to ensure that the power is off.
7. Connect the load to the secondary.
8. Replace all enclosure covers.
9. Energize the unit.
The temperature of the enclosure exterior for encapsulated transformers should
not exceed ambient plus 65°C (149°F) rise as indicated in UL
Conduit hubs, closure plates, and oth er eq uipment intended to be field installed on
NEMA Type 4X units shall be selected and installed to maintain the environmental
integrity of the enclosure.
®
Standard 506.
ENGLISH
3Rev. 00, 39000-243-01 © 2000–2018 Schneider Electric All Rights Reserved
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