History:
Over 10 years in the domestic and commercial environment
Answers:
If you have an old fuse box you will also have old wiring. essentially there is nothing 'unsafe' with old installations - they will comply to the regulations around at their time of installation. however, old wiring will have been used and will over time wear out just like anything else, the main problem being in the breakdown of insulation. new fuse boxes have switches that are extremely sensitive and if there is a breakdown these switches will not accept the wiring, meaning it cannot be done or causing nuisance tripping. another problem with old wiring is that electrical screws can become lose, causing wires to become loose, causing unsafe situations. on the flipside, if the wiring is ok, and you have earthing to water stopcock and gas, you will only make it safer by upgrading the fuse box.
hope this is of some help to you.
cheers
will
power electrical