Tension Wire Mounted Short Pendant

I am planning to use a wire track system between 2 wall cabinets 1.8m apart, anchoring the wires to the top of the cabinets. How much tension is required in the wires ie would anchoring the wires this way be strong enough?
Yes, as long as the material of your cabinet is quite solid and not too thin it will be strong enough. However we`d recommend using the minimum amount of light heads to keep the weight down.

Do these fittings take LED bulbs? Also, can the angles of the individual lights be adjusted? Thanks.
GY6.35 lamps are not available as LED`s however they are energy saving. The lights cannot be adjusted as they are only pendants on wire flex.

Are these dimmable?
The lamp that this fitting takes is dimmable. If you plan to dim your tension wire system you would need a dimmable transformer.

Can I use a drum transformer with these pendants on a tension wire system
Yes absolutely a big old wire wound transformer is perfect for tension wire systems. Please note however that these types of transformers can buzz when dimmed.

What width cable installation is needed for these pendants?
You may choose from 4mm or 6mm cable. Your total load determines which you should use i.e. 200w or lower use 4mm, over 200 watts use the 6mm cable.

I would like to run a wire track over a 3m space above our table and hang 3 or 4 pendants from it. Is there any limit to number on one track? Can the pendants be moved along the track easily or once installed are they fixed permanently? How is the power installed? I would hope to take from our overhead light fitting. What exactly do I need to buy to set all of this up?
The tension wire system uses either 100va, 200va or 300va transformers. Your load cannot exceed the rating of the transformer. So 6 x 50w lamp is the maximum load. on a 300va transformer. Lights can be moved but if this is going to be a regular occurrence you should consider a rigid track. A short length of the tension wire is used to take power from the transformer to the track. The feed into the track can be clamped on anywhere on the length of the track. If this is being fixed to the ceiling, you`ll require 8 metres of tension wire (4mm if using four pendants and 6mm if using more), a transformer, ceiling deflectors (suspect three), two tension holder packs, your feed-in, and of course your pendants. The wire wound transformers can be dimed on leading edge dimmers - see the listing for more details.

I`ve heard that toroidal transformers create a large start-up current, so I may need to upgrade my MCB to a `C`-type. How can I tell if I already have a suitable MCB, as assume upgrading is expensive.
Don`t even concern yourself with inrush current unless you plan to have more than ten 300va transformers on the same circuit. Your standard MCB will handle your loads without any issues at all.