Siemens S7-400 Cabling Inside Buildings, How to Read the Table, Connect Cables for Run

Assembling and Installing Systems

A.7 Cabling Inside Buildings

Introduction

Inside buildings, clearances must be observed between groups of different cables to achieve the necessary electromagnetic compatibility (EMC). Table A-2 provides you with information on the general rules governing clearances to enable you to choose the right cables.

How to Read the Table

1.Look up the type of the first cable in column 1 (Cables for ...).

2.Look up the type of the second cable in the corresponding field in column 2 (and Cables for ...).

3.Read the routing specifications in column 3 (routing ...).

Table A-2 Cabling Inside Buildings

Connect Cables for ...	and Cables for ...	Run ...
LAN signals, shielded	LAN signals, shielded	in common bundles or cable
(SINEC L1, PROFIBUS DP)	(SINEC L1, PROFIBUS DP)	ducts
Data signals, shielded	Data signals, shielded
(programming devices, operator	(programming devices, operator
panels, printers, counter inputs,	panels, printers, counter inputs,
etc.)	etc.)
Analog signals, shielded	Analog signals, shielded
DC voltage	DC voltage
(≤60 V), unshielded	(≤60 V), unshielded
Process signals	Process signals
(≤25 V), shielded	(≤25 V), shielded
AC voltage	AC voltage
(≤25 V), unshielded	(≤25 V), unshielded
Monitors (coaxial cable)	Monitors (coaxial cable)
	DC voltage	in separate bundles or cable
	(>60 V and ≤400 V), unshielded	ducts (no minimum clearance
	AC voltage	necessary)
	(>25 V and ≤400 V),
	unshielded
	DC and AC voltages	Inside cabinets:
	(>400 V), unshielded	in separate bundles or cable
		ducts (no minimum clearance
		necessary)
		Outside cabinets:
		on separate cable racks with a
		clearance of at least 10 cm
		(3.93 in.)

Automation System S7-400	Hardware and Installation	A-17
A5E00850741-01