Methods
| Method | Where |
|---|---|
| Terminal blocks | Boxes, panels — standard |
| Spring clamps (Wago) | Boxes, fast assembly |
| Crimping | Thick wires, ground |
| Welding | Old standard, strong |
Rules
No twists (PUE forbids); the contact must be inspected — a loose terminal heats up; in the box — access for inspection; different metals — through terminals.
Why it matters
Weak contact — heating and fire: about 30% of electrical fires start in connections.