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Answer for USA, Canada and countries running a 60 Hz power supply service.(LIFE SAFETY WARNING! [disclaimer]

Electricity is dangerous!

You can be injured or killed!

Improper installations can cause fire, injury and death!)

The fuse or over-current device in the service entrance equipment which limits current flow is the determining factor in the service's rating [assuming that the over-current protection is properly sized for the conductors used!]

Therefore, if the main fuses are 100 Amp, it is a 100 Amp service, even if it has 3 fuses. The exception to this is a service having more than one disconnect [allowed under the six-disconnect rule], wherein you might have a 100 Amp service with the largest fuse or breaker being 60 Amps! ... or two 100 Amp panels fed with a 200Amp cable - is it a 100 Amp or 200 Amp service?

Barring seeing a picture or being there physically, my guess is that you have a 100-amp service.

I can only guess what the "hydro meter" is.

Is there more than one meter?

It could be that the "hydro meter" is the off-peak service meter for your water heater power! [In the Philadelphia area, PECo has historically provided the option to have some loads powered through a second meter at a reduced rate, controlled by a clock or other means, which is shut off during peak demand hours.]

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS

WORK SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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Q: If the overall main fuse box has two 100A cartridges in it does that mean the amp service is 100A or is it 200A and what is the 'hydro meter'?
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