Niche market wire pull question

M

MacG

Member
All,

I am reading a white paper about minimizing electrical noise on electrical system in niche markets like recording studios. ISO Grounding is employed as a minimum but to further cancel noise on a 120vac circuit that are talking about twisting the hot and neutral about 4 turns per foot while the insulated/isolated ground remains out of the twist. Iso MC Cable is listed as a second best because f the twisted in insulated ground. Not being involved in such an installation, Belden has a 12 ga twisted pair in a jacket but it is only rated at 300 volts so how would one put 4 twists per foot for the circuit pair on site?

Curious,

MacG
 
O

OldBroadcastTech

Senior Member
Location
Western IL
Occupation
Retired Broadcast Technician
MacG said:
All,

I am reading a white paper about minimizing electrical noise on electrical system in niche markets like recording studios. ISO Grounding is employed as a minimum but to further cancel noise on a 120vac circuit that are talking about twisting the hot and neutral about 4 turns per foot while the insulated/isolated ground remains out of the twist. Iso MC Cable is listed as a second best because f the twisted in insulated ground. Not being involved in such an installation, Belden has a 12 ga twisted pair in a jacket but it is only rated at 300 volts so how would one put 4 twists per foot for the circuit pair on site?

Curious,

MacG
Click to expand...
Unreel it with plenty to spare (cause it will get 'shorter' when twisted), clamp one end solidly, chuck the other end in a 1/2 drill and fire away !

We (electronics school students) used that method to make twisted-pair filament leads back in vacuum-tube days.

Of course, @ 18 was a lot easier to work with and we didn't need much of it.......
 
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