An EL 01 can perform all types of electrical and telecommunications installations, as well as minor plumbing under RCW 18.106.150. And then there are the following electrical specialty licenses.
WAC 296-46B-920(2)(a) details the scope of an EL 02.
Limited Energy System (06)
HVAC/Refrigeration Restricted (06B)
Nonresidential Maintenance (07)
Nonresidential Lighting Maintenance and Lighting Retrofit (07A)
Residential Maintenance (07B)
Restricted Nonresidential Maintenance (07C)
Door, Gate, and Similar Systems (10)