Proper installation of high-current IP67 terminal posts is essential for achieving the rated electrical performance and environmental protection. Even the best-designed connector will fail prematurely if installed incorrectly. This guide covers the key installation steps for LYD’s rectangular terminal post series, including 120A, 150A, 200A, 300A, and 400A models.
Tools You Will Need
- Torque wrench (capable of 2-8 Nm range)
- Hex key or socket for mounting nuts
- Wire stripper (for C-Type cable lug connections)
- Crimping tool (hydraulic recommended for 50mm²+ cable)
- Deburring tool for panel cutout edges
Step 1: Prepare the Panel Cutout
- Drill or punch a clean rectangular or square hole per the dimensional drawing provided with your terminal post.
- Deburr all edges to prevent damage to the silicone O-ring during installation.
- Ensure the panel material is clean, dry, and free of oil or grease.
Tip: A rough cutout edge can compromise the IP67 seal. Use a file or deburring tool to smooth sharp edges.
Step 2: Position the O-Ring and Terminal Post
- The silicone O-ring is pre-installed in the groove on the underside of the terminal post flange.
- Verify the O-ring is seated evenly with no visible twists or gaps.
- Insert the terminal post through the panel cutout from the outside.
Step 3: Mount and Torque
- Place the mounting bracket or washer on the inside of the panel.
- Thread the mounting nuts and tighten by hand until snug.
- Use a torque wrench to tighten to the specified torque:
- 120A-200A models: 2.5 – 3.5 Nm
- 300A-400A models: 4.0 – 6.0 Nm
- Apply torque evenly in a criss-cross pattern if multiple fasteners are used.
CAUTION: Over-torquing can damage the PA66 housing or extrude the O-ring. Under-torquing will leave gaps in the seal. Always use a calibrated torque wrench.
Step 4: Connect the Cable or Busbar
For C-Type (Cable Lug):
- Select a ring terminal or battery cable lug sized for your cable gauge and the terminal post stud diameter.
- Strip the cable insulation to the correct length for the lug barrel.
- Crimp the lug using the correct crimping die for your lug size.
- Slide the lug onto the terminal stud and secure with the provided nut and washer.
- Tighten to specified torque.
For A-Type (Busbar):
- Ensure the busbar contact surface is clean and flat.
- Apply a thin film of anti-oxidation compound (optional but recommended for aluminum busbars).
- Bolt the busbar directly to the rectangular pad using the provided hardware.
Step 5: Verify the Seal
- Visually inspect the O-ring compression around the perimeter of the terminal post base.
- Confirm there are no visible gaps between the flange and the panel surface.
- If possible, perform a continuity check between the terminal post and the panel ground to verify proper installation.
Common Installation Mistakes
| Mistake | Consequence | Solution |
|---|---|---|
| O-ring not seated properly | Water ingress, IP67 failure | Inspect O-ring groove before mounting |
| Over-torquing mounting nuts | Cracked housing, crushed O-ring | Use torque wrench; follow spec sheet |
| Rough panel cutout | O-ring damage during insertion | Deburr all cutout edges |
| Wrong cable lug size | Poor electrical contact, overheating | Match lug to stud diameter and cable size |
Need Technical Support?
For detailed dimensional drawings or installation assistance, email nick.xu@lyd123.com.
