nvent SES320 Series User manual

WARNINGS
• Safety First - Hazardous Voltage & Shock Hazard
• Only qualified licensed electricians should install or service SPDs
• Hazardous voltages exist within SPDs
• SPDs should never be installed or serviced when energized
• Use appropriate safety precautions including Personal Protection Equipment
• Failure to follow these instructions can result in death, serious injury, and/or equipment damage
• This manual shall be read in its entirety prior to installing
Bonding and Grounding Hazard
Verify that the neutral conductor in the service entrance equipment is bonded to ground in
accordance with the National Electric Code (NEC®) and all applicable codes. During installation into an
electrical system the panel must not be energized; or the Circuit Breaker de-energized, until the SPD
is completely installed, inspected and tested. All conductors must be connected and functional
including the neutral (if required).
The voltage rating of the SPD and system must be verified before energizing the SPD. Failure to
follow these guidelines can lead to abnormally high voltages at the SPD. This may cause the SPD
to fail. The warranty is voided if the SPD is incorrectly installed and/or if the neutral conductor in the
service entrance equipment or downstream of separately derived systems is not bonded to ground in
accordance with the NEC®
Do Not Hi-Pot Test SPDs
Any factory or on-site testing of power distribution equipment that exceeds normal operating voltage
such as high-potential insulation testing, or any other tests where the suppression components will
be subjected to higher voltage than their rated Maximum Continuous Operating Voltage (MCOV)
must be conducted with the SPD disconnected from the power source. For 4-wire systems, the
neutral connection at the SPD must also be disconnected prior to performing high-potential testing.
Failure to disconnect SPD and associated components during elevated voltage testing will damage the
SPD and will void the warranty.
SPDs on Ungrounded Systems
Caution - Ungrounded systems are inherently unstable and can produce excessively high line-to
ground voltages during certain fault conditions. During these fault conditions, any electrical
equipment including an SPD may be subjected to voltages which exceed their designed ratings. An
SPD designed specifically for Ungrounded systems should be used.
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© 2022-2024 nVent All Rights Reserved IP9018_D
nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
Surge Protective Device
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at 1.
www.nVent.com and from your nVent customer service representative.
nVent products must never be used for a purpose other than the purpose for which they were designed or in a manner that exceeds specified load ratings.2.
All instructions must be completely followed to ensure proper and safe installation and performance. 3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property 4.
damage, serious bodily injury and/or death, and void your warranty.
SAFETY INSTRUCTIONS:
All governing codes and regulations and those required by the job site must be observed.
Always use appropriate safety equipment such as eye protection, hard hat, and gloves as appropriate to the application.

specifications without prior notice.
IP9018_D © 2022-2024 nVent All Rights Reserved
INSTRUCTION SHEET
Surge Protective Device
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nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
SES320 Series
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at 1.
www.nVent.com and from your nVent customer service representative.
nVent products must never be used for a purpose other than the purpose for which they were designed or in a manner that exceeds specified load ratings.2.
All instructions must be completely followed to ensure proper and safe installation and performance. 3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property 4.
damage, serious bodily injury and/or death, and void your warranty.
SAFETY INSTRUCTIONS:
All governing codes and regulations and those required by the job site must be observed.
Always use appropriate safety equipment such as eye protection, hard hat, and gloves as appropriate to the application.
PRE-INSTALLATION & INSTALLATION PLANNING
Unpacking & Preliminary Inspection
Inspect the entire shipping container for damage or signs of mishandling. Remove the packing materials
and further inspect the unit for any obvious shipping damages. If any damage was found and is a result
of shipping or handling, immediately file a claim with the shipping company and forward a copy to
nVent.
Storage Environment
This SPD should be stored in a clean, dry environment. Storage temperature range is -40°C (-40°F) to
+60°C (+140°F). Avoid exposure to high condensation.
Operating Environment
The standard unit uses a NEMA 4X enclosure. Flush-mount kits are available as option. Before installing,
ensure that your enclosure type and application are appropriate with regard to moisture, dirt, excessive
dust, flammable materials or atmospheres, corrosive vapors, etc. This SPD is designed in an ambient
temperature range of -25°C (-13°F) to +85°C (+185°F) with a relative humidity of 0% to 95%
(noncondensing). Excessive temperature may inadvertently operate internal thermal over temperature
protectors.
Line Side versus Load Side Installation
· SES320 B & BC Series is tested and Listed as a Type 1 SPD per UL 1449 5th Ed. This SPD can be installed on
the Line Side of the service overcurrent device. Type 1 SPDs may also be installed in UL Type 2 Applications.
In general, it is more practical to install as Type 2 on the load side of the main overcurrent Device for
maintenance reasons.
· SES320 F & FC Series is tested and Listed as a Type 2 SPD per UL 1449 5th Ed. This SPD can only be
installed on the Load Side of the service overcurrent device.
Audible Noise
SPD background noise is negligible or non-existent, and does not restrict the location of installation.
Lead Lengths & Maximizing SPD Performance
SPDs must be located as close to the circuit as possible to minimize let-through voltage. Use the shortest
& straightest possible leads. Pre-Plan installations and ensure that nearest breaker positions are used. If
new construction, adjust breaker locations as appropriate. When longer leads are unavoidable, gently
twist leads together (one to two twists per foot), or tie-wrap leads together.

global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
SES320 Series
www.nVent.com
specifications without prior notice.
TECHNICAL SUPPORT
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nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
INSTRUCTION SHEET
Surge Protective Device
© 2022-2024 nVent All Rights Reserved
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at 1.
www.nVent.com and from your nVent customer service representative.
nVent products must never be used for a purpose other than the purpose for which they were designed or in a manner that exceeds specified load ratings.2.
All instructions must be completely followed to ensure proper and safe installation and performance. 3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property 4.
damage, serious bodily injury and/or death, and void your warranty.
SAFETY INSTRUCTIONS:
All governing codes and regulations and those required by the job site must be observed.
Always use appropriate safety equipment such as eye protection, hard hat, and gloves as appropriate to the application.
Voltage Rating
Before installing SPD, verify that it has the same voltage rating as the power distribution system.
Compare the SPDs nameplate voltage or model number and ensure that SPD configuration matches the
intended power source.
Circuit Breaker Connected
When connected on load side of main disconnect, we suggest connecting via a 30A circuit breaker. Ensure that
the circuit breaker can accommodate the number of phases the SPD is designed for. The circuit breaker is the
intended disconnect switch and provides short circuit protection to the connecting conductors. These SPDs
have internal overload protection elements within the product. These SPDs have demonstrated 200kA Short
Circuit Current Ratings (SCCRs).
System Grounding
An equipment grounding conductor must be used on all electrical circuits connected to the SPD. For the
best performance, use a single point ground system where the service entrance grounding electrode
system is connected to and bonded to all other available electrodes, building steel, metal water pipes,
driven rods, etc. (for reference see: IEEE Std 142-2007). For sensitive electronics and computer systems,
we recommend that the ground impedance measurement be as low as possible.
When metallic raceway is used as an additional grounding conductor, an insulated grounding conductor
should be run inside the raceway and sized per the NEC®. Adequate electrical continuity must be
maintained at all raceway connections. Do not use isolating bushings to interrupt a metallic raceway
run. A separate isolated ground for the SPD is NOT recommended. Proper equipment connections to
grounding system and ground grid continuity should be verified via inspections and testing on a regular
basis as part of a comprehensive electrical maintenance program. On 4-Wire Power System Service Entrance
Panels, neutral to ground bonding (Main Bonding Jumper) must be installed per the NEC®. Failure to do so
WILL damage SPDs.
CAUTION: This unit must be installed in conformance with all governing codes and instructions. A Type 2 SPD must be
installed on the load side of the main over-current protection.
Retro-fit Into Existing Panel with No Available Breaker Positions
Follow all applicable Codes:
Consider consolidating loads in a manner that might free breaker positions.
A ten foot tap rule in NEC® 240.21(B)(1) allows you to tap the bus as long as the tap conductors are
rated at least 10% of the ampacity of the panel. In the case where the ampacity of the panel is larger
than the wires of the SPD, consider tapping the bus per NEC® 240.21(B)(1) and running appropriate size
conductors to a safety switch fused to 30A. Mount the SPD immediately adjacent to the safety switch.

INSTALLATION
Pre-Plan your installation
• Meet all National and Local codes. (NEC® Article 242 addresses SPDs)
• Mount SPD as close to panel or equipment as possible to keep leads short
• Ensure leads are as short and straight as possible, including neutral and ground.
• Consider a breaker position that is closest to the SPD and the panel’s neutral & ground
• Suggested breaker size is 30A.
• Make sure system is grounded per NEC® and clear of faults before energizing SPD.
1. Use a voltmeter to check all voltages at installation. Validate voltages meet ratings of the SPD being installed.
2. If utilizing Dry Contacts, pre-plan their installation.
3. Disconnect power at the electric panel. Confirm that the panel is deenergized.
4. Identify breaker location and SPD location.
5. Remove an appropriately sized knockout from panel.
6. Mount SPD using approved wiring method, including seals appropriate for the enclosure rating.
7. Unscrew the lock nut from base of SPD. Feed leads through an 3/4" sized conduit and into panel. Press the conduit
into the tabs of the SPD base. Secure conduit to the SPD with the lock nut.
8. Connect SPD leads as appropriate so that the leads are as short and straight as possible.
9. Label leads as appropriate
Energized: black and orange*
Neutral: white
Ground: green
10. Validate system is bonded per the NEC® and is clear of hazards or faults before energizing (N-G bonding not per
NEC® will fail SPDs (only at Service Entrance)).
11. Energize and confirm proper operation of indicators and/or options. If Audible Alarm cycles, de-energize
immediately and contact nVent for help.
nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
specifications without prior notice.
SES320 Series
TECHNICAL SUPPORT
IP9018_D 4 OF 5
www.nVent.com
INSTRUCTION SHEET
Surge Protective Device
© 2022-2024 nVent All Rights Reserved
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at 1.
www.nVent.com and from your nVent customer service representative.
nVent products must never be used for a purpose other than the purpose for which they were designed or in a manner that exceeds specified load ratings.2.
All instructions must be completely followed to ensure proper and safe installation and performance. 3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property 4.
damage, serious bodily injury and/or death, and void your warranty.
SAFETY INSTRUCTIONS:
All governing codes and regulations and those required by the job site must be observed.
Always use appropriate safety equipment such as eye protection, hard hat, and gloves as appropriate to the application.

nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
INSTRUCTION SHEET
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
SES320 Series
Surge Protective Device
© 2022-2024 nVent All Rights Reserved
TECHNICAL SUPPORT
www.nVent.com
specifications without prior notice.
IP9018_D 5 OF 5
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at 1.
www.nVent.com and from your nVent customer service representative.
nVent products must never be used for a purpose other than the purpose for which they were designed or in a manner that exceeds specified load ratings.2.
All instructions must be completely followed to ensure proper and safe installation and performance. 3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property 4.
damage, serious bodily injury and/or death, and void your warranty.
SAFETY INSTRUCTIONS:
All governing codes and regulations and those required by the job site must be observed.
Always use appropriate safety equipment such as eye protection, hard hat, and gloves as appropriate to the application.
OPERATION
LED Operation
Each SPD contains 2 green LEDs per line shown in the appropriate voltage configuration. When the LEDs are green complete
protection is present. Upon MOV failure the LED corresponding to the failed mode will extinguish.
Audible Alarm
Similar to the LEDs the Audible Alarm will sound upon suppression element failure. The Audible Alarm may be silenced by
removing power to the SPD.
Dry Contact
Three 18", 22 AWG wires are included through the nipple as the Form C Dry Contacts. The Contacts change state during
inoperative conditions, including loss of power. Any status change can be monitored elsewhere via the Relay Contacts.
• Please note: Dry Contacts are designed for low voltage or control signals only
• Maximum switching current is 2A
• Maximum switching voltage is 240Vac
• Higher energy applications require additional relay implementation outside the SPD
• Yellow/White is Common, Black is Normally Open and Brown is Normally Closed. If the Dry
Contacts are not utilized, insulate lead ends, coil and secure.
Surge Event Counter*
• The digital readout below the LED indicator light display the number of surge event the unit encounters.
(*): SES320FC and SES320BC ONLY
MAINTENANCE
SPDs require minimal maintenance. We recommend periodic inspection of diagnostic indicators to ensure proper operation.
We also recommend keeping the SPD clean as appropriate.
Troubleshooting & Service
Please contact us for any service related issues.
Table 1: Diagnostics Table for the SES320 Series
(*): SES320F and SES320FC ONLY
L1 LED L2 LED L3 LED Alarm LED Audible Action
Green Green Green Off Off The SPD is Operational
Off Off Off Off Off No Power to the Unit; Check Circuit Breaker
1 or 2 LEDs Off Flashing Red On Check Line Voltages; Replace Unit
Green Green Green Flashing Red On (*)Check N & G Connections, Voltage N-G (GRM Fault)