Emerson Nelson Installation Manual

Fast, easy installation of
heat tracing systems

Nelson™ AX and EX Heat Trace Connection Kits

A complete range of heat trace connection kits for the most demanding environments.

Connect heat trace cables safely and
securely in harsh and hazardous locations.

NelsonTM AX and EX Connection Kits by Emerson, provide robust, weatherproof,
corrosion-resistant connections for heat trace cables in ordinary, rugged industrial
environments and hazardous locations.

• Fiberglass reinforced polyester construction withstands rugged conditions.

• Nonmetallic enclosures are suitable for use in extreme weather and corrosive
environments (IP66, NEMA 4X).

• Large, modular enclosures and DIN-rail mounted terminal blocks provide for easy
installation and service.

• Spring-clamp terminals simplify wiring and ensure a dependable connection,
with no need to tighten screws.

• LED indicating lights available for positive verication of connections to power
distribution.

2

Nelson AX and EX Connection Kits are engineered to
adhere and exceed industry standards.

Specifications Certifications

• Minimum Installation Temperature: –40°C (–40°F)

• Ambient Temperature Use Range: –50°C to +55°C
(–58°F to +131°F)

2

• Acceptable Conductor Size: 1mm

2

6mm

(8 AWG)

(18 AWG) to

• Operating Voltage Range: 108 Vac to 300 Vac

• Max Continuous Current: Up to 25A in standard

congurations, 38A for -LLT options

• Enclosure Material: Fiberglass reinforced, carbon
impregnated, UV resistant polymer, black

• Weight: Splice and Power Connection Kits 1 kg (2.2 lbs)

• Weight: Tee Connection Kit 2 kg (4.4 lbs) Ingress Protection:
NEMA 4X, IP66

• Terminals: Spring-type terminals

• Lid Screws: Stainless steel captive screws

®

2017; NFPA 70: National Electrical Code®, International :

NEC
Electrical Code, IEEE Std 515TM - 2011 Standard for Testing, Design,
Installation, and Maintenance of Electrical Resistance Heat Tracing
for Industrial Applications

— Class I, Division 2, Groups B, C, D
— Class II, Groups E, F, G (Canada Only)
— Class III (Canada Only)
— Enclosure Type 4X, Temperature Code T6 – T3
— Class I, Zone 1; Ex e II; T6 – T3 

— Class I, Division 2, Groups B, C, D
— Class II, Groups E, F, G; Class III
— Enclosure Type 4X, IP66,
— Temperature Code T 
— Class I Zone 1; AEx e IIC T

— -40°C ≤ Tamb ≤ 55°C

—

II 2 G Ex e IIC T6-T3  Gb

—

II 2 D Ex tb IIIC T80°-T195° C

—

-40° C ≤ Tamb ≤ +55° C

For temperature code, see heating cable or design information



3

Delivering ultimate resilience and durability
for rugged, harsh and hazardous locations.

AX and EX universal connection kits for industrial use
– giving specifying engineers a complete selection of
connection kits for any heat trace application.

• Tough, lightweight, corrosion-resistant polyester
construction

• Specially treated to resist UV degradation

• Fiberglass reinforced for exceptional durability
and impact resistance

• Carbon-impregnated to prevent buildup of
static charge

• Reinforced standoffs to resist cracking in rugged
environments

Our AX and EX series includes all the kits you need to

connect heating cables in any conguration and verify

operation of heating cable circuits. We also offer power,
splice and tee splice connection kits without enclosures
and terminals for maintaining your existing infrastructure.

4

Versatile and Dependable

Power

Connection Kit

• Power connection kits are designed for
terminating one heater cable to customer
supplied power wiring.

• Optional long life LED indicating light for

supply power verication.

Powered Splice

Connection Kit

Splice

Connection Kit

• Connection kits are used to connect two
heater cables to each other in a splice

conguration.

• It may be used to extend cable length,
connect different wattage cables together
or to provide access to service removable
equipment.

End-of-Circuit

Termination Kit

Tee Splice

Connection Kit

• Tee splice connection kits are used to
connect up to three heater cables.

• It may be used to connect multiple heater
segments, connect different wattage cables
together or to provide access to service
removable equipment.

End of Circuit Light

Termination Kit

• Powered splice connection kits are used
to connect up to three heater cables to
customer supplied power wiring.

• Optional long life LED indicating light for

supply power verication.

Visit nelsonheaters.com or contact your local Nelson Heat Trace representative to learn more about our AX and EX connection kits.

• Our end of circuit termination kit is designed
for terminating one heater cable while
allowing access for periodic maintenance
and/or trouble-shooting.

• Our lighted end of circuit termination kit is
designed for terminating one heater cable
with a non-directional lens assembly and
long life LED output.

5

Connects in any environment.

1

Every AX and EX Connection Kit includes all the
accessories you need to create safe, reliable,
protected connections. These accessories vary

2

3

7

6

4

by type of kit, and may include:

1. Junction box

2. Lid with captive screws

3. Terminal block

4. Standoff

12

8

15

10

14

11

9

5

13

5. 6" guide tubes

6. Enclosure adapter

7. End cap

8. Silicone adhesive

9. Locknut

10. Termination components

11. Pipe clamp

12. Ground wire tubing

13. Cable clamp

14. Cable grommet

15. Cable tie

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Select Kits and Options for Every Application

Step 1: Choose Connection

SKU

NEC IEC

Power Connection Kit

Splice Connection Kit

Tee Splice Connection Kit AXTC125 EXTC125

Powered Slice Connection Kit  AXPTC125 EXPTC125

End-of-Circuit Termination Kit HEC100

End of Circuit Light Termination Kit HEL100

Power Connection Kit Without Enclosure HPC100

Splice Connection Kit Without Enclosure HSC100

Tee Connection Kit Without Enclosure HTC125

 Use sufx -LLT for use with LLT Long Line Self-Regulating heaters.
 Use sufx -LR for Red or -LG for Green indicating light.

Pipe Clamp for 3" or smaller pipe diameter -3

Pipe Clamp for 3" to 12" pipe diameter -12

 AXPC100 EXPC100

 AXSC100 EXSC100

Step 2: Select Clamp



SUFFIX

Pipe Clamp for 12" to 20" pipe diameter -20

 Each kit contains a clamp, but must be selected separately.

Step 3: Select Optional Accessories

SUFFIX

Pipe Adaptor for 1" or smaller pipe diameter HC-SPA

Fiberglass Tape – ½" x 60 yards GT-60

Fiberglass Tape – ½" x 20 yards GT-6

Aluminum Tape – 2" x 50 yards AT-50

Warning Sign WS100

Step 4: Place Your Order

Visit nelsonheaters.com or contact your local Nelson Heat Trace representative to learn more about our AX and EX connection kits.

7

Innovative and reliable heat trace solutions
for demanding environments.

Your local contact: Emerson.com/contactus

Emerson.com

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