To achieve a passing score on your electrical exam you need to understand what a SDS is. What is a SDS? It is an acronym for a separately derived system. Can you answer the following question:
Which of the following can be installed as a code approved (SDS) separately derived system:
I. Power transformer
II. On-site generator
III. 240v/120v 1θ service
IV. None of the above
Solution:
I, II & III only.
NFPA 70 defines a (SDS) separately derived system as: “An electrical source, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.”
This definition identifies a SDS as an electrical source (other than a service) with no direct connection to the circuit conductors of any other electrical source, with the exception of those established by grounding and bonding connections. While a power transformer and on-site generator may be installed as a separately derived system, a service regardless of size or rating may not be installed as a SDS.
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