Electrical & Electronic

9-99  It's so simple

Connection benefits from gun control

Problem There are many ways of connecting wires. By far the simplest is to twist them together and wrap the join in insulation tape – unfortunately it is unlikely that there are any quality standards for this.

Rail-mounted terminal connections are a more professional idea. Not only do they provide a decent means of anchorage but they also allow the connectors to be colour coded and identified for easier assembly and recognition. They also satisfy the numerous directives on wiring standards with regard to proximity and insulation.

The most common type use small screws to either clamp the wire directly or force up plate up or down, locking it into place and making the connection. But this takes lots of screws, which need to be loosened and re-tightened to make the connection. There may also be a problem with pull-out. Unless the clamping pressure can be guaranteed it may be difficult to satisfy certain directives covering this phenomena.

Solution Entrelec has arrived at a solution that not only satisfies the major wiring directives but also makes assembly a less intensive process. By completely removing the need for threaded fasteners to anchor the wires, the company claims to have brought connection time down to 30 per cent that of clamping screws.

CONNEC1.JPEG (22013 bytes)The connection is enabled by the use of a pistol-shaped tool. An unstripped wire is introduced into the terminal, the ‘pistol’ tool is positioned and the trigger is pulled.

The tool causes a clamp to cut through the insulation and make a connection. The whole process takes two seconds. Once the tool is operated it is impossible not to complete the sequence because the tool will not release unless a connection has been made.

Applications This type of device, which not only saves time but also makes the user’s life easier, will find many applications across the electrical installation spectrum. It is especially suitable for difficult-to-reach areas where access with a screwdriver may be difficult. The process produces a gas-tight connection that is completely tamper proof and no preparation is needed. Pull out tests exceed IEC 947-7-1 and vibration and corrosion levels exceed DIN 57 611 1977. MF