Basement Wiring

I am remodeling my basement replacing old ceiling with drywall.
It had 3 light's run off of old type wiring, dropped in center of basement rafters, then it was wrapped & taped to the 3 lights. It is controlled by switch on top of staircase.
I am putting 6 new Halo's in with new wiring on its own circuit from the main panel.
I want to put a 7th Halo at the bottom of the stairs using the old wiring controlled by the stair switch. Do I put the old wires in a junction box tied to new wires going to the 1 Halo? If so do I need to have a small opening access door in the drywall ceiling for the concealed box. Is there any other way of doing this with out the access door in the ceiling?
In my new wiring in the rafters from Halo to Halo lighting can I use NM-B Romex, or do I need to use Metal Clad or Armored cable?
Thanks, Ed
Bay Village,Ohio.

 

What do you mean by old wiring? Knob and Tube? If it old 2 wire cable you can bring it into the box of the Halo if it long enough,otherwise it must be boxed and accessible,you and certainly run the NM-B between fixtures.
Geo

Mod Note: most recessed lights now call for 90 degree C rated insulation so older wiring cannot be used.

 

Does the cable have a ground wire? Ungrounded cable can not be extended because new cable must meet code and have a ground. Yes, the new junction box must remain assessable.Abandoning the existing cable and running new from the breaker box would be best practice.Yes unless not allowed by local code.

 

Here is a picture of the wire. I have only 10" of it coming out of rafter.
Ed

 

That is K&T. Not reusable and unsafe. Run new cable.

 

This one K&T line dropping in the basement rafters is on a top of the stairs switch. It was tied to three other lights, that have been removed. I wanted to keep one light on the switch for going down stairs. I understand you about not adding to the line.
If I do not add on the line & put the 2 wires in rafters in a box & use one of the existing lights I took down will that work.
Ed

 

Not sure what you were saying. Best practice the K&T needs to be abandoned. The K&T can not be extended because new wiring must have a ground wire and K&T doesn't have a ground to connect new cable to.

 

Ok Thank you. New line it will be

 

K&T often had the neutral switched instead of the hot as in today's wiring. You m ade the correct choice to replace it.