The house is circa 1960. The electrical panel is glass fuses. The whole
house runs off the box of 8 glass fuses. They are 30 amp.
I wonder if the electrical fuses should be 20's and someone has replaced
them with 30's. How do I determine what is the correct size?
I have just recently become familiar with the house...it belonged to my
The tenant blew a fuse, running a leaf blower and fryer all at the same
time. I told her to try a 20 amp fuse first, but she said it sparked and
wouldn't physically screw in. (did she have it crossthreaded, I don't know)
But the 30 was fine. After a couple of hours after replacing the fuse, I
asked her to feel the panel box and notice if anything was warm or hot...she
Are the 20's and 30's the same size?
If the box was built for 30's and I replace them with 20's, what's the
damage? And vice versa.
How tough is it to replace a glass fuse breaker box with a modern breaker
That's a very real possibility, as the wire going through the
house is almost guaranteed to be 20 Amp capacity at best, likely
15 Amp in some places.
More on that later...
Way too many unknowns in that description, sorry.
She kept the leaf blower and fryer running all of that time?
Something tells me probably not.
Standard glass fuses, yes. There is a type where there are
adapters that *do* vary in size by amperage rating. If that's
what you have then they should/could be different.
It's not "the box", it's the wiring running through the walls,
but to answer -- none at all. You would be being "extra safe"
Exactly the opposite. Warning, danger, alert the fire department,
they ma want to keep a truck stationed at the nearest hydrant.
(the "more later" that I promised) Not at all for a competent
professional. Please don't take it personally, but by the very
scope of your questions, this is obviously not an area of
expertise for you. There may be more involved than just
replacing the panel (probably everything out through and
including the meter base and the wiring up to the utility co's
connection point.) $ Ballpark? 800-1500 bucks, that's for
the 'going rates" in this part of the country, your mileage
At the *very* least, pay an electrician for a couple of hours
work to open up a few outlets/fixtures and the box, check some
wire sizes and determine what fuses are *required* to make it
all safe. Then lock your tenants out of the panel, if that's
legal in your municipality.
The real Tom Pendergast [ So if you meet me, have some courtesy,
aka I-zheet M'drurz [ have some sympathy, and some taste.
Thank you for all of your replies. Nothing was taken personally, I 100%
admit that I am an electrical numbskull. Just some things that sounded and
looked out of whack with the electrical. I have been around enough old
houses and older people that I have seen the fuses replaced with too big
fuses and knew that probably didn't make good sense. It will certainly
become a priority on the "to-do" list.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.