Prysmian 6243YH Grey 1.5mm² 3-Core & Earth Cable 50m Drum (96941)

PVC twin flat and earth is not suitable for installation either buried direct in the ground or in ducts in the ground. BS7671 (UK Wiring Regulations) requires any cable installed in the ground to have a metallic armour. We would therefore recommend using cable manufactured to BS5467.

We recommend that in the interest of yours and others safety that you contact a qualified electrician who can help guide you through this process. This is even more important given that any new circuit added to an installation needs to be assessed and approved by a part P registered electrician. In the event that you are looking to procure the item prior to introducing an electrician we recommend that you consult the manufacturers instructions provided with the equipment, this should give guidance as to the suitable connections required. Also, consultation of BS7671, Requirements for electrical installations, Table 4D5 will give you the maximum current rating for each cable size in relation to the installation method used. In the end you may find that the cable you have selected here is not appropriate for the intended use and that a 2 core 10mm², as a base guide, would be more appropriate - but again, please check thoroughly.

Answering my own question... clips for 4mm cable work fine.

Normally would not be used externally unless it were 'out of reach' or suitably protected. This cable would be degraded by U.V. radiation. Also voltdrop and fusing needs to be confirmed. Check with a qualified electrician.