Siemens S7-400 Additional Measures, Ser Cables for Equip transition point 0 With, Order No

Assembling and Installing Systems

A.9.2 Rules for the Transition between Lightning Protection Zones 0 and 1

Rule for the Transition 0 <-> 1 (Lightning Protection Equipotential Bonding)

The following measures are suitable for lightning protection equipotential bonding at the transition between lightning protection zone 0 <-> 1:

•Use grounded, spiralled, current-conducting metal strips or metal braiding, for example, NYCY or A2Y(K)Y, as a cable shield at the start and end

•Lay the cables in one of the following ways:

--in continuous metal pipes that are grounded at the start and end

--in ducts of armored concrete with continuous armoring

--on closed metal cable racks grounded at the start and end

•Use fiber-optic cables instead of lightning stroke current-carrying cables.

Additional Measures

If you cannot take the measures listed above, you must install a high-voltage protector at transition 0 <->1 with a relevant lightning conductor. Table A-3 contains the components you can use for high-voltage protection of your plant.

Table A-3 High-Voltage Protection of Cables with the Help of Surge Protection Equipment

Ser.	Cables for ...	... equip transition point 0 <--> 1
No.			with:
1	3-phase TN-C system	1 piece of	DEHNbloc/3 lightning
			conductor
			phase L1/L2/L3 to PEN
	3-phase TN-S system	1 piece of	DEHNbloc/3 lightning
			conductor
			phase L1/L2/L3 to PE
		1 piece of	DEHNbloc/1 lightning
			conductor
			N to PE
	3-phase TT system	1 piece of	DEHNbloc/3 lightning
			conductor
			phase L1/L2/L3 toN
		1 piece of	DEHNgap B/n N-PE light-
			ning conductor
			N to PE
	AC TN-S system	2 pieces of	DEHNbloc/1 lightning
			conductor
			phase L1 + N to PE
	AC TN-C system	1 piece of	DEHNbloc/1 lightning
			conductor
			phase L to PEN

Order No.

900110* 5SD7 031

900110* 5SD7 031

900111*

5SD7 032

900110* 5SD7 031

900 130*

900111*

5SD7 032

900111*

5SD7 032

Automation System S7-400	Hardware and Installation	A-23
A5E00850741-01