Laying separate lives | Archive Titles

Table 1: Separation distances between power and signal cables
Signal cable		Power cable
	Twin & earth (mm)	Steel wire amoured (mm)	MICC (mm)
Plain	150	125	Touching
UTP	75 below 100 MH^z	50	Touching
	125 above 100 MH^z
Screened	Touching	Touching	Touching

Table 2: Types of cable screens
Cable Type	Noise reduction
	50 H_z magnetic	RF
Plain (no screen, no twist)	none	none
Twisted pair	good	none
MICC	none	good
Twisted pair MICC	good	good
Plain in steel trunking or conduit	good	good
Plain with braid or metal tape screen	none	good
Twisted pair with braid or metal tape screen	good	good
Steel wire armoured	good	good
Plain in correctly designed and installed aluminium trunking or conduit	none	good
Twisted pair in correctly designed and installed aluminium trunking or conduit	good	good