STYLE YOUR CRIMP
With reference to reader Bill Nicholson’s comments about trailer sockets (‘Socket to Us’, Your Letters, November 2018), these can be a problem on caravans where a refrigerator is fitted. Both the fridge feed and the earth pins can carry heavy currents and must be kept clean and tight. What is not often realised is that the connections on the rear of the pins/sockets must also be tight.
This has been highlighted in domestic situations where a smart meter is fitted and the screws have not been correctly tightened onto flexible cable. The cable can soften and ‘creep’ under heavy currents, resulting in a poor joint that will then degrade further due to heat.
The solution is to crimp a ferrule onto the end of the lead and fit this into the connector. This is not always possible in the restricted space of 12N and 12S connectors, so a pin or blade crimp should be used.
These must be set on the wire using pressure-release or ratchet crimping tools – plier-type tools won’t do the job. As was suggested by Mr Nicholson, a liberal coating of Waxoyl or similar should be applied to both the front and back of the connector. Ed Dinning