Do you mean your nonprofit educational foundation which makes electrical home appliances, including boilers and electrical storage heaters is ALREADY
REGISTERED to ISO 9001:2000 and !SO 14001? If so, you should ask your registrar to lend you a copy of ISO 18001 which they probably have in their library, along with "audit pointers" they may have for clients.
If I misunderstand and your organization is merely
compliant, consider that 14001 and 18001 are similar in language and therefore complying with 18001 (safety) is like complying with 14001 (environmental.)
The pdf file at this website has a chart comparing the two Standards section by section. Perhaps you can get an idea that you merely need to make some minor additions to your 14001 manual to include 18001.
http://www.ceaa-acve.ca/confer2002/McLeodP.pdf
We have several 18001 experts who visit the Cove. They will happily answer specific questions about applicability of 18001 to your operation if you supply sufficient details about your operation when you ask.