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| Inspection, Testing and Certification of Electrical Installations This Section is STRICTLY for testing PROBLEMS which members have occured, misunderstood readings, Periodic Inspection Reporting, Mathematical Equations/Solutions, Part P and other legislation which require you to Inspect and Test. |
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05-06-2008
| #1 (permalink) |
| Junior Member Join Date: Jun 2008
Posts: 1
 |  High Zs readings Hi, can anyone help? I've recently carried out a PIR on a school building which has 1 main distribution board supplying 9 other distribution boards around the school. Most of the installation is fine except for a number of circuits which have higher than normal Zs readings according to the given tables. Each D.B. has BS EN 60898 mcb's and are mostly type c. There are no RCDs throughout the whole installation and most of these circuits are supplying just sockets and lights. Is there anything I can do to overcome this such as putting type B mcbs in which would make the acceptable readings higher or fitting RCDs to these circuits? Many thanks. |
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