Published: 6 December 2018
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BEAMA Technical Bulletin - consumer unit 16 KA conditional rating
BEAMA Technical Bulleting explaining the application of the 16 kA conditional rating described in Annex ZB of BS EN 61439-3 for consumer units.
BEAMA
BEAMA Technical Bulletin - consumer unit 16 KA conditional rating
Published: 6 December 2018 · Category: Training related PDFs
BEAMA Technical Bulleting explaining the application of the 16 kA conditional rating described in Annex ZB of BS EN 61439-3 for consumer units.
From this document
Bringing power to life. CONSUMER UNIT 16 kA CONDITIONAL RATING APPLICATION December 2018 Consumer Unit paper.indd 1 23/11/2018 09:51 Origin of 16 kA single-phase prospective short-circuit current1 BS 7671: 2018 IET Wiring Regulations 18th Edition Regulation 313.1 requires the prospective short-circuit current (PSCC) at the origin of the installation to be determined by calculation, measurement, enquiry or inspection. PSCC information can be obtained by enquiry and should be provided free of charge by Distribution Network Operators (DNOs). Also, guidance on the estimation of maximum PSCC on the Low Voltage (LV) network and at the supply terminals is given in the Energy Networks Association publication Engineering Recommendation P25 Issue 2 20182. P25 states that the maximum design value of the PSCC for single-phase 230 V supplies up to 100 A should be taken as 19.6 kA at the connection of the service to the LV distribution main cable. P25 clarifies that the value of 19.6 kA assumes zero metres of service cable/overhead line is connected. In practice, the service length will be greater than 2 metres, reducing the PSCC to less than 16 kA (BS 7671 Regulation 536.4.201 also refers); see Figure 1. This is the reason for the consumer unit 16 kA conditional rating test. 19.6 kA PSCC at the connection of the service to the LV distribution main cable LV distribution main cable HOUSE In practice, the maximum PSCC is 16 kA at the incoming house service cut-out Generally, the DNO LV...
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