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The most popular option to light large areas of buildings. They come in a variety of connection types and power ratings.

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Do the ballast connectors just puul off?

There are ballast replacements on eBay, for example:
Tridonic PC 1/28 DD PRO

But will the plastic connectors just pull off? They don't seem very inclined to, and I cannot see any "prizing points".

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It seems they do come off .... with a good deal of prizing! Looks like the ballast/connectors were a special version for designplan, or an earlier version. Having prized the plastic ends off, the wires just fall out.

According to the eBay seller, the Tridonic ballast has grey connectors which you push the wire into, and to remove them you press down on the grey tab to free them.

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Those snapshots appear out of focus and difficult to see up close where terminals are shown.

Some electrical connectors for single wire connection (not stranded wires) are push-on types where inserting a solid copper wire is slipped into a claw like terminal. Once pushed in, the single jaw prevents pulling the wire out. These terminals may have a pinhole to insert a tool to depress the jaw and allow pulling out the wire. Other terminals have a slotted screw to unscrew to release each wire.

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Some are clipped on but you normally have to unscrew them.

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