Architekten / Planer

The successful integration of shields in rooms and installation on existing systems requires a close cooperation with architects and planners. Important are for example thickness of materials, method of mounting, corrosion properties, expansion of the shielding surface, method of installation of floor shields, ceiling shields, quality requirements for substrates like floors etc. Isoline calculations of the electrical equipment and/or measurements of magnetic fields provide a basis for the consulting and planning of shielding. 


Comply with the AGW/IGW according to NISV::

Description

Electrical systems must respect the legal limits according to the regulation on non-ionising radiation, NISV. The immission limit values apply for commonly accessed areas. The precautionary emission limit has to be fulfilled at “places with sensitive use”. “Places with sensitive use” are for example residential buildings, office rooms, kindergartens, children playgrounds and patient waiting rooms. The first step of planning the nature of the measure is usually an isoline calculation. Based on the results, the measures can be determined.

We offer advise throughout the planning phase for new systems as well as renovations of existing systems and develop solution proposals. Based on the project planning, we also take over the execution of the measures. This includes the provision of materials, coordination of the mounting and dates, project management and professional installation.


Planning of surface shielding/room shielding::

Description

Architects/Planners often receive specifications in order to ensure certain magnetic field values in rooms. Such rooms are for example:

  • Hospitals (protection of people and equipment such as EEG/EKG/EMG)
  • Workplaces (protection of people)
  • Research facilities (protection of equipment such as microscopes, E-Beam writers)

Emitting sources of magnetic fields are for example:

  • High-voltage power lines
  • Railway lines
  • Transformer stations, mains distribution boards, electrical cables
  • Research magnets

Usually there are no guidelines on how the fields have to be limited. Systron EMV GmbH has the necessary know-how to implement such projects and provides proposals accordingly. Based on that, invitations to tender are written or direct contracts are assigned to Systron.   


Planning guidelines PR-NIS of the city of Zurich

The city of Zurich wants to treat all building technical basic installations of city-owned buildings, regarding their electromagnetic pollution according to standardized guidelines, to ensure the same conditions for all users.
The “Planning guidelines non-ionising radiation PR-NIS" lanungsrichtlinie Nichtionisierende Strahlung PR-NIS” were created for this reason. Users and operators receive an electromagnetically immission-low indoor climate in rooms, where people stay for a longer period of time, on a regular basis. For people who may be classified as particularly sensitive (e.g. children and people in need of special care), an increased protection against non-ionising radiation is sought. The PR-NIS sets no special requirements regarding the radiation limits of mobile devices (PC, printer, mobile phones).

PR-NIS limit values of the city of Zurich

Limit values of the city of Zurich in comparison with the limit values of the NISV on the example of the immissions at 50Hz.

House installations transformer installations
NZB
(PR-NIS)
NZA
(PR-NIS)
OMEN
(NISV)
Not sensitive
use
(NISV / PR-NIS)
>4h / Day or
>800h / Year
>4h / Day or
>800h / Year
>4h / Day or
>800h / Year
<4h / Day or
<800h / Year
 GNZB GNZA  AGW IGW

 1µT
500V/m

0.4µT
50V/m
1µT
5kV/m
100µT
5kV/m

Limit values according to usage

 

Category Use SIA
2024
NZB
GNZB
NZA
GNZA
Notes
General Sales area (corridor,
entrance)
X     to all categories
  Side room (Stock, Technique,
Archive)
X     to all categories
  Toilet, bath, shower X     to all categories
  warehouse, shipping X X   only personal workspace
  Parking garage (public, private) X      
  Lavatory and drying room X      
  Children playgrounds     X  
  Server room X      
  Building plot   X   on which sensitive use approved
Live Living space, bedroom X   X  
  Kitchen X X    
  Home office, crafting room   X    
Administration Single and group offices X X   to all categories
  Open-plan office X X   to all categories
  Conference room X X   to all categories
  Main hall, reception X X   only personal workspace
School and 
sport building
Schoolroom     X  
  Nursery     X  
  Teacher's lounge X X    
  Library X X    
  Lecture room X X    
  Special rooms (physics, and
chemistry rooms, school kitchen)
X X    
  Gym, sports hall X X    
  Fitness room X X    
  Indoor swimming pool X X    
  Cloackroom, showers X      

Meeting places

Theater, cinema X      
  Multi-purpose hall X      
  Exhibition hall X      
Hospital,
care home
Bedrooms X   X  
  Nurse station X X    
  Practice treatment rooms X X    
Reastaurant Restaurant X      
  Cafeteria X X   only personal workspace
  Kitchen of the restaurant X X    
  Kitchen of the  cafeteria X X    
  Cold storage room X      
Hotel Hotelroom X X    
  Reception, lobby X      
Industry Production (rough work) X     according to SUVA
  Production (fine work) X     according SUVA
Sales Furniture X      
  Food X      
  Construction and garden X      
  Supermarktet (Food/Nonfood) X      
  Specialist retail, store X      
  Jeweler X      
  Collector area   X    

Limit values for fields

Limit values for low-frequency  and high-frequency fields

Frequency Limit values use zone B
(GNZB) of Zürich city
Limit values use zone A
(GNZA) of Zürich city
                Electric field
strength
[V/m]
Magnetic flux 
density
[µT]
Electric field
strength
[V/m]
Magnetic flux
density 
[µT]
1 Hz 1'000 0.4 100 100
25 Hz 1'000 0.4 100 100
50 Hz 500 0.4 50 50
2.5 kHz 10 0.4 1 1
1 MHz 10 0.4 1 1
10 MHz 3 0.01 0.3 0.3
400 MHz 3 --- 0.3 0.3
2 GHz 6 --- 0.6 0.6
300 GHz 6 --- 0.6 0.6

What are the key issues?

 

  • Keep distribution sites and raised zones as far as possible away from quite zones
  • Course of main lines and trays
  • Concept grounding systems
  • Feed lines from distribution panels are to be arranged as a star if possible
  • Shielded cables for permanent consumers
  • Place power outlets so that only short connection cables are sufficient
  • Place lines so that quiet zones are not affected

Possible shielding solutions for climbing zone

 Steigzone


 
 
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