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Musician questions

Former Community Member
Former Community Member

Hi there, 2 questions using my Seaward Apollo 500:

1- my radio connection between guitar and amplifier has a separate PSU, so is class 3? Should I simply PAT this as class 2?

2- my bass combo amp is a pretty new Ashdown Studio 15 which does not have any class marking (apart from RoHS CE) so has to be class 1? But this device fails earth continuity and I don't believe it is manufactured to earth the exposed metal parts. Can I ignore this test? If so, for what reason?

Thank you.

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    Class I equipment may have no obvious exposed-conductive-parts.

    However, in the case of a guitar amplifier with mains input the [accessible] exposed-conductive-parts could include instrument jacks etc. …. the circuits they are connected to are often supplied by PELV to reduce noise and static “pops”. Things like the jacks are an exposed-conductive-part simply because they are connected to PE (anything accessible on the ELV side could become live in a fault if the PE conductor were broken).

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  • 0

    Class I equipment may have no obvious exposed-conductive-parts.

    However, in the case of a guitar amplifier with mains input the [accessible] exposed-conductive-parts could include instrument jacks etc. …. the circuits they are connected to are often supplied by PELV to reduce noise and static “pops”. Things like the jacks are an exposed-conductive-part simply because they are connected to PE (anything accessible on the ELV side could become live in a fault if the PE conductor were broken).

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