1.Understanding XHHW and XHHW-2 Cables
Before diving into termination techniques, it's essential to understand the properties of Type XHHW wire and its upgraded counterpart, Type XHHW-2 cable.
Type XHHW Wire:
Rated for 90°C in dry locations and 75°C in wet environments.
Features cross-linked polyethylene (XLPE) insulation for chemical and heat resistance.
Commonly used in conduit systems, service entrance applications, and industrial wiring.
Type XHHW-2 Cable:
An enhanced version rated for 90°C in both dry and wet conditions.
Suitable for direct burial and areas with higher moisture exposure.
Often preferred for outdoor installations and underground feeders.
XHHW 1AWG (1 Gauge):
A thicker variant designed for high-current applications.
Requires specialized tools for stripping and termination due to its large conductor size.
These cables meet NEC (National Electrical Code) standards, but improper termination can compromise their performance and safety.
2.Tools and Materials Needed
To terminate Type XHHW-2 wire or Type XHHW wire in a junction box, gather the following:
Junction box (UL-listed, sized per NEC 314.16)
Wire strippers (rated for XHHW insulation)
Cable connectors (anti-short bushings for metal boxes)
Terminal lugs or wire nuts (compatible with wire gauge)
Torque screwdriver (for precise tightening)
Heat-shrink tubing (optional, for added moisture protection)
Grounding pigtail (for bonding)
3.Step-by-Step Termination Process
Step 1: Prepare the Junction Box
Choose a box large enough to accommodate the Type XHHW-2 cable or XHHW 1AWG conductors. NEC requires at least 6 inches of free conductor length inside the box.
For metal boxes, install anti-short bushings to prevent insulation damage from sharp edges.
Step 2: Strip the Cable Insulation
Use a sharp wire stripper to remove the outer jacket of the Type XHHW wire. Avoid nicking the inner conductors.
For XHHW 1AWG, consider a rotary stripper to handle the thicker insulation.
Step 3: Secure the Cable
Fasten the cable to the junction box using approved clamps or connectors. This prevents strain on the termination points.
Step 4: Terminate Conductors
For Splices:
Twist stranded conductors tightly and secure with wire nuts rated for the wire size.
For XHHW-2 cable in wet locations, apply waterproof gel-filled connectors.
For Terminal Lugs:
Crimp lugs onto stripped ends using a hydraulic crimper. Torque terminal screws to manufacturer specifications.
Step 5: Grounding
Attach a grounding pigtail to the junction box (if metal) and bond it to the circuit's ground wire.
Step 6: Final Inspection
Ensure no exposed conductors, proper strain relief, and compliance with box fill calculations (NEC 314.16(B)).
4.Common Mistakes to Avoid
Ignoring Box Fill Limits: Overfilling a junction box with XHHW 1AWG wires can cause overheating.
Improper Stripping: Damaged insulation on Type XHHW-2 wire increases short-circuit risks.
Loose Terminations: Undertightened lugs or nuts lead to arcing and fire hazards.
5.Why Choose XHHW-2 Over Standard XHHW?
Type XHHW-2 cable offers superior flexibility and moisture resistance, making it ideal for outdoor or corrosive environments. Its 90°C wet rating ensures compliance with modern energy codes, especially for solar installations and HVAC systems.
Dongguan Greater Wire & Cable Co., Ltd. has 6 production workshops working together with extremely high production efficiency. Our R&D team has 12 professionals who focus on optimizing cable performance. Our THHN WIRE, TC-ER CABLE and other products have passed UL83, UL44, UL719 and other certifications to ensure safe and stable operation in various complex environments. In terms of price, due to efficient production processes and large-scale procurement, we can provide American customers with 25% lower prices than local brands, saving costs for your project and improving competitiveness.