Paul Sanderson asks about the effect on tripping (if any) of using a 230/240V RCBO at 110/120V. His question is answered by Legrand (Theme – Distribution Equipment):
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| A Legrand RCBO - will it work at 110V? |
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This Q & A of the Day is one of thousands answered by our Voltimum Experts on a daily basis in our Technical Expertise area.
Question: How will the RCD tripping mechanism of a RCCB (or RCBO) rated for 230-240V be affected when it is used on the 110-120V supply (of a transformer)?
Will the response time be longer, shorter or not affected at all?
Is it necessary to have a main incoming RCCB on the 110V panel (via a 230/110V transformer) when the transformer is already protected by the MCB on the RCCB side of a split load panel?
Answer: RCBOs and RCCBs will fully operate, including the test function, without affecting tripping times at lower rated voltages.
The operation voltage limit does depend upon the product being used as there are variations between the products and different manufacturers.
Legrand's RCBOs and RCCBs do have different operation limit voltages - for example, the single module RCBOs for consumer units are from 110V up to 253V, but the version for panel and Type B boards range from 100V up to 253V. Our single pole + neutral RCBOs are 100V for the 10mA and 30mA versions and 170V for the 300mA.
It's always best to ask the manufacturer direct, quoting the part number in question.
In my opinion you would normally protect the secondary side of a transformer as the MCB is only protecting the primary side, but refer to BS 7671:2008 Wiring Regulations if you are unsure.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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