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Span Cable Tap off Unit Electrical Bus Duct Conventional Bars Boards
No multi-line power inside the cable riser. Only 3-phase line cables, no messy. No multi-line power inside the cable riser, no messy. No multi-line power inside the cable riser, no messy.
Tested to IEC 61439-2 for line cable tap off unit. Yes, tested to IEC standard. Nil.

Rated Current Tested
Model SC95 for 50mm² to 95mm² line cable is 275A, 415V.
Model SC150 for 120mm² to 150mm² line cable is 350A, 415V.
Model SC240 for 185mm² to 240mm² line cable in 500A, 415V.
Model SC500 for 300mm² to 500mm² line cable is 900A, 415V.
Model SC630 for 630mm² line cable is 1000A, 415V.

As per manufacturer rating, but need special Bus Duct Tap Off Unit. Busbar Board is much bigger in sizes.
Cable termination is much easy as just spicing out the line cable insulation without cutting of main cables. By mean of plug in Bus Duct Tap Off Board. Line cable need to cut and joint to earth phase Busbar individually.
Output Cables can be tap off from the Span Line Tap by tighten it by hexagon screws. By mean of plug in Bus Duct Tap Off Board. Individual BAR need screw holes by mean of cable lugs
Fast Installation with cable cutting & crimping of cable lugs Need skill labours to fabricate. Labour intensive as more cable casting & jointing work
Fast and cost effectiveness installation Still require manufacturer plug in Tap Off Board. Usually is 300 to 500% costly than normal line tap. Slow and not cost effective installation. Every board need cut and crimp cable lugs and output from the Busbar.
No condensation problems Condensation may caused power trip and whole riser power shut down. Condensation may caused power trip and whole riser power shut down.
Cost effective and low maintenance cost Not cost effective but replacement of parts are costly as model may changed and no spare replacement Not cost effective but replacement of parts are costly as model may changed and no spare replacement
Cost saving of 300% overall cost is too high and no saving for Developer. Contractor labour cost is much higher.