OSG Standard Circuits - 3A lighting

Former Community Member over 4 years ago

As we are all using led lamps / fittings now it seems this should be a standard circuit.

3A MCB with 1.0/1.0 cable

Lighting circuits used to be based on 100w incandescent lamp / room at 1800 lumens which is equiv to 20w led.

What are the figures for max distance for a 3A type B using 1.0/1.0 as an addition in table 7.1 page 66 in OSG?

0 Former Community Member over 4 years ago

Led switching discussed in this previous recent topic:

https://communities.theiet.org/discussions/viewtopic/1037/27010?post_id=149029#p149029
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0 Zoomup over 4 years ago

geoffsd:
Zoomup:
geoffsd:

Why? 1.00 sq.mm. T&E, method C, has a CCC of 16A.

Why 1.0mm2?

Hi Zoom.

You have moved the question mark and completely altered the meaning of what I wrote.

Hello Geoff. Were you not implying that a 16 Amp rated cable in the form of 1.0mm2 protected by a B3 M.C.B. is too large, and smaller cables could be used?

Z.
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0 Chris Pearson over 4 years ago

Or that there is no good reason to use a B3 MCB; especially since AFAIK, 1 mm² is the smallest size of T&E.
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0 geoffsd over 4 years ago

No, in reply to the idea of using a 3A MCB on light circuits.

Why (use a 3A MCB)?

1.00 sq.mm. T&E, method C, has a CCC of 16A.
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OSG Standard Circuits - 3A lighting

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