PLR’s are strip fixtures that can be plugged end-to-end
PLR stands for Plug, round PLF stands for Plug, flat
PLR1 – black and white
PLR1G – with ground
PLR1LV – low voltage (includes dimming leads) PLR1LVG – same with ground
PLR2 – two circuits
PLR2x – specify which fixture is connected
PLR2AB – all ballasts connected to this circuit
PLR22 – crossover, so alternating fixtures are on each circuit. Black alternates with red.
PLR3 – three circuits
PLO CRE - with no plug on one end goes on the end fixture for the electrician to splice in through the access panel.
PLR_X – fixture not connected to PLR (for auxiliary power for night lighting or something)
PLF_ - rectangle 4 conductor plug harness. Will not fit through 7/8” diameter knockout. Work best with strip fixtures where end plate can be removed. PLF is the old standard, we only really use it now to fit into existing runs, etc.