By Brian Scaddan IEng; MIIE (elec)

This booklet builds at the uncomplicated wisdom and strategies coated in sixteenth variation IEE Wiring laws defined and Illustrated, supplying the knowledge and revision fabrics wanted for the town & Guilds 2400 (Design, Erection and Verification of
Electrical Installations) examination. All Qualifying Managers can be required to realize this qualification, and Brian Scaddans publication is the appropriate textual content for all scholars project C&G 2400 courses.

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Additional info for 16th Edition IEE Wiring Regulations: Design and Verification of Electrical Installations

Sample text

2 ohms. 8 Evaluation of thermal constraints Fault current / is found from: Where: Uoc= open circuit voltage at supply transformer Zs = calculated value of loop impedance / = 453 A t for 500 A from IEE Regulations curves, Figure 7 is approx. 012 s. k from IEE Regulations Table 54C is 115. 5 mm2 CPC is perfectly adequate. 43 mm2 CPC could be used. 5 mm2 CPC and protected bya40ATypeBMCB. EXAMPLE 3 Four industrial single-phase fan assisted process heaters are to be installed adjacent to each other in a factory.

How, for example, can a verifier accept that the correct size conductors have been installed, without design details (IEE Regulations 712-01-03 iv). 49 Inspection and testing So, let us start, as they say, at the beginning. Armed with the results of the Assessment of General Characteristics, the designer's details, drawings, charts, etc. together with test instruments, the verification process may proceed. Inspection Usually referred to as a visual inspection, this part of the procedure is carried out against a check list as detailed in the IEE Regulations, section 712, and in greater detail in the Guidance Notes for inspection and testing.

Figure 26 Healthy ring with interconnection. Sockets A, B and F will give identical readings. C, E and D will not Here is an example that shows the slight difference between measurements on the phase/CPC test. 5 mm2 CPC. Figure 27 illustrates this arrangement when cross connected for test purposes. 27 m-ohms/m. 109 ohms. The same values apply from Y to A and YtoB. 137 ohms. e. 145 ohms. 008 ohms) the amount is too small to suggest any faults on the ring. Protection against direct contact by barriers or enclosures If an enclosure/barrier is used to house or obscure live parts, and is not a factory-built assembly, it must ascertained whether or not it complies with the requirements of the IP codes IP2X, IPXXB or IP4X.

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