My 1983 house has a Sylvania box, and it takes the common Murray/Siemens
breakers. Two 15/15s will set you back $17. I don't know if it is
Challenger, but I expect all early 80s Sylvanias used the same breakers.
For about the same price you can get a quad breaker that lets you put two
240v circuits in 2 slots. That will probably be easier because you don't
have to move anything, but you will probably have to go to an electrical
supply house to buy it.
You can buy a whole lot of breakers for the cost of a new installed panel.
I take it you don't have central A/C or an electric dryer if your load is
only 62a.

"Arnie Goetchius" wrote in message
...
Have a 1500 sqft home (built 1985) with 100 amp service and a load of
about 47
amps. We would like to add an electric wall oven (3600 va) which would
bring the
load up to 62 amps. The problem is that the breaker box is full. (There
are only
16 breaker slots). I know there are side-by-side 15A breakers which take
up only
half the space. I would like to put 4 of the existing circuits on the
these
side-by-side breakers so I could free up two slots. Once I do that, I can
put
in a 240 volt 20 Amp double breaker for the oven.

Question 1: I have seen the side-by-side breakers for Square D but this
box is a
Sylvania-Challenger. Are there side-by-side breakers for the Challenger?

Question 2: If not, how much might I expect to pay (very roughly) to have
an
electrician (Central NJ) swap out the Challenger for a 20 slot Square D
including the permit, temporary disconnect of power and inspection?