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Discuss Wylex BS3871 mcbs? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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sixfingers

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Hi guys i have an installation with some old wylex bs3871 mcbs fitted on side of mcb is printed Breaking capacity M9,I take it that would mean 9k breaking at? And also as bs3871 maximum earth fault loop impedance reading are no longer in current regs would you use the bs60898 max readings? Or have i missed the page for them? Cheers
 
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sixfingers

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  • #2
Hi guys any ideas would be great! Regards sixfngers
 
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Spudnik

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  • #3
Give me a mo and ill check the book.
 
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sixfingers

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  • #4
Cheers jason thought i d bring it to top of pile again!:)
 
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Spudnik

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  • #5
have a look at OSG page 99 at the bottom.

Use table 2D Page 103
 
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sixfingers

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Cheers guys as for M9 on side of mcb? Any ideas?
 
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Spudnik

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  • #8
Thats the short circuit capacity

Page 57 OSG Table 7.4
 
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