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So how many BS1362 fuses do you get for seventy quid?

Audiophile plug fuses on Ebay

I'm over run with the ordinary 13-amp fuses and end up throwing them away! Is that for a single fuse?

Andy B.

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0 gkenyon over 5 years ago

Andy Millar:

The only area where I might have some sympathy on the mains side is if the user wanted a clean earth. But even then really well designed equipment should allow for separation of the safety earth from any functional (interference screen) earth - although I'll bet most, if not all, audiophile equipment doesn't. I'm sure others on this forum know far more than I do about how to supply a clean earth whilst still staying compliant to the regs.

BS EN 50310 (IEC 30129) has some good information - the general principle, though, is usually to provide combined protective and functional earthing within a common bonding network. This will best-align with BS EN 62305-series.

The provision of a totally separated "clean earth" with its own earth electrodes is fraught with difficulty and introduces real safety issues - and anything less that "totally separated" means that the functional earth is susceptible to voltages and currents in the protective earthing system. For example, in order that a separated earth electrode is not influenced by another earthing system, the electrodes have to be many metres away from any and all buried metalwork connected to the protective earthing system - see Figure 16 of BS 7430. This also means that any of the separated functional earthing system becomes an extraneous-conductive-part to the protective earthing system: if it is not "main-bonded" in accordance with BS 7671, it becomes a touch voltage hazard during a fault. And then there are surge protection issues to address ...

Hence, fully separated functional earthing systems are not often used ... best to adopt good practices for deriving effective earthing (for EMC and noise reduction purposes) using a combined system.
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0 gkenyon over 5 years ago

Andy Millar:

The only area where I might have some sympathy on the mains side is if the user wanted a clean earth. But even then really well designed equipment should allow for separation of the safety earth from any functional (interference screen) earth - although I'll bet most, if not all, audiophile equipment doesn't. I'm sure others on this forum know far more than I do about how to supply a clean earth whilst still staying compliant to the regs.

BS EN 50310 (IEC 30129) has some good information - the general principle, though, is usually to provide combined protective and functional earthing within a common bonding network. This will best-align with BS EN 62305-series.

The provision of a totally separated "clean earth" with its own earth electrodes is fraught with difficulty and introduces real safety issues - and anything less that "totally separated" means that the functional earth is susceptible to voltages and currents in the protective earthing system. For example, in order that a separated earth electrode is not influenced by another earthing system, the electrodes have to be many metres away from any and all buried metalwork connected to the protective earthing system - see Figure 16 of BS 7430. This also means that any of the separated functional earthing system becomes an extraneous-conductive-part to the protective earthing system: if it is not "main-bonded" in accordance with BS 7671, it becomes a touch voltage hazard during a fault. And then there are surge protection issues to address ...

Hence, fully separated functional earthing systems are not often used ... best to adopt good practices for deriving effective earthing (for EMC and noise reduction purposes) using a combined system.
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So how many BS1362 fuses do you get for seventy quid?

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