Re: Variable 60A load
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Mon, 21 Nov 2005 08:55:23 +1100
"Ira Rubinson"
>
> Does anybody know how to build or where to buy a variable 60A load that I
> can use to test household circuit breakers? For example, I want to know if
> a
> 20A breaker will really trip at 20A. Portability is a must.
> Thanks -Ira
>
** I use a 300VA toroidal transformer fitted with a low voltage overwind
made with heavy gauge silicone coated wire. This winding will deliver up to
50 amps at 2 volts for a minute or two.
Current into a load, ie circuit breaker or fuse, is controlled by means of a
variac and monitored on a rms amp meter in the primary circuit. The primary
to secondary current ratio is the exact inverse of the off load voltage
ratio.
OTOH - for the ultimate in portability, try using a C size Ni-Cd cell as a
source of high current - 60 amps is well possible.
........... Phil
.
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