Cam-Lok / Powerlock

Understanding Cam-Lok and Powerlock Connectors

High-power connectors are essential for professional LED installations. Understanding these systems ensures safe and efficient power distribution.

Connector Types

**Cam-Lok (Marinco/Hubbell):**

• Most common in US entertainment
• Distinctive cam-action locking
• 400A, 200A, and smaller ratings
• Single-conductor design

**Powerlock (Meltric):**

• European origin, growing US presence
• Spring-loaded locking
• Various current ratings
• NOT compatible with Cam-Lok

**Powersafe (Various):**

• Generic term for similar connectors
• Check compatibility carefully
• Brand-specific connections

Color Coding Standard

**Three-Phase + Neutral + Ground:** | Color | Function | US Phase | |-------|----------|----------| | Black | Phase A | L1 | | Red | Phase B | L2 | | Blue | Phase C | L3 | | White | Neutral | N | | Green | Ground | G |

**Always verify connections—colors must match function.**

Connector Sizes and Ratings

**400A Cam-Lok:**

• Largest common size
• Main venue power tie-in
• 4/0 AWG cable typical
• Company switch feeds

**200A Cam-Lok:**

• Medium distribution
• Sub-panel feeds
• 2/0 AWG cable typical

**100A and Below:**

• Smaller distribution needs
• Various connector options
• May use pin and sleeve instead

Assembly and Use

**Proper Connection:** 1. Verify dead circuit 2. Match colors precisely 3. Fully seat connector 4. Engage locking mechanism 5. Verify secure connection

**Disconnection:** 1. Verify load is off 2. Disengage lock mechanism 3. Pull straight out 4. Never yank on cable

Safety Critical Points

**Compatibility:**

• NEVER mix brands
• Cam-Lok ≠ Powerlock
• Forcing causes damage and arc flash hazard

**Inspection:**

• Check for damage before each use
• Look for: burnt contacts, cracked housings, damaged cables
• Replace damaged components immediately

**Current Rating:**

• Never exceed rated current
• Account for derating factors
• Temperature affects capacity

Distribution Configurations

**Typical Setup:** 1. Venue power (bus bars or lugs) 2. Company switch with Cam-Lok output 3. Cam-Lok runs to distro 4. Distro breaks out to smaller circuits

**Cable Management:**

• Protect from traffic
• Avoid water/moisture
• Support cable weight
• Maintain minimum bend radius

Alternatives for Smaller Loads

**Pin and Sleeve:**

• 20A-100A common
• Interlocked switching
• Good for sub-distribution

**Powercon:**

• Individual panel connections
• 20A typical
• Not for main distribution

Best Practices

**Pre-Event:**

• Advance with venue for power specs
• Verify Cam-Lok vs Powerlock
• Check phase rotation
• Plan distribution layout

**Load-In:**

• Connect before energizing
• Verify all connections
• Test phase rotation
• Document current readings

**Show:**

• Monitor temperatures
• Check connections periodically
• Have spares available