Mains Fuse Placement in bench test equipment

[Gregg]

For mains powered test equipment such as oscilloscopes or bench meters, should the fuse be in the mains circuit before or after the power switch and why?  I can see arguments for both cases. 

[tautech]

If it's powered by SMPS and has a standby rail for power ON it needs be at the point of entry.

[pigrew]

An additional question: where should the EMI filter be and why?

[tautech]

An additional question: where should the EMI filter be and why?

After the fuse so if it blows the fireworks are contained.

[Gregg]

If it's powered by SMPS and has a standby rail for power ON it needs be at the point of entry.

That makes sense, the power is needed for the switch activate on the rest of the device.
I just put a linear power supply into my FeelTech FY6600 along with a C14 grounded outlet, a proper fuse and holder; the question popped into my head while wiring it.  If the fuse blows and I can turn off the switch, I don't have to unplug it. 
I decided that if the fuse is ahead of the cheap Chinese switch it may be of some advantage and I'd probably unplug it anyway if the fuse blew; that's how I wired it in any case.

[Brumby]

I decided that if the fuse is ahead of the cheap Chinese switch it may be of some advantage

or ANY switch for that matter.  Being cheap or Chinese doesn't change the value of the fuse being first ... just the odds of finding out.

I'd probably unplug it anyway if the fuse blew

A healthy approach.  Get used to doing this every time for everything.

[Neilm]

IEC61010 (the standard for test & measurement equipment) does give guidence on this. IIRC, EMI filters are allowed to be before the fuse (for instance built into the mains socket). The fuse should definately be before the switch though.