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Electrical Inspection & Testing Forum
USB outlets in sockets
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<blockquote data-quote="Doc Hudson" data-source="post: 461157" data-attributes="member: 1607"><p>With new circuits, a hand full of Wago's should allow a quick test on the full cable run @ 500v prior to fitting the USB accessories. But on EICR, or additions to a circuit that already has USB's scattered around I would do 500v L-&gt;E, N-&gt;E (or L+N-&gt;E). Then L-&gt;N @ 250v. Unless I've seen manufactures documentation saying their USB sockets can withstand 500v IR testing I would assume they will be damaged and not test at that voltage. I don't think I would start opening up existing USB accessories to isolate them from testing, to then put them back in circuit afterwards, as I think this is more likely to introduce faults that weren't there before.</p><p></p><p>On a slight tangent, do these USB sockets have any natural earth leakage via their circuitry? e.g. if you had a lot of them all fed from the same RCD could you get nuisance tripping problems. </p><p></p><p>Doc H </p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 461157, member: 1607"] With new circuits, a hand full of Wago's should allow a quick test on the full cable run @ 500v prior to fitting the USB accessories. But on EICR, or additions to a circuit that already has USB's scattered around I would do 500v L->E, N->E (or L+N->E). Then L->N @ 250v. Unless I've seen manufactures documentation saying their USB sockets can withstand 500v IR testing I would assume they will be damaged and not test at that voltage. I don't think I would start opening up existing USB accessories to isolate them from testing, to then put them back in circuit afterwards, as I think this is more likely to introduce faults that weren't there before. On a slight tangent, do these USB sockets have any natural earth leakage via their circuitry? e.g. if you had a lot of them all fed from the same RCD could you get nuisance tripping problems. Doc H [/QUOTE]
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