Copyright © ATL Transformers Ltd 2019
Doc Ref TECH148 Issue 1
7
2.2 PRODUCT OPERATION
Supplied as standard for Class I distribution systems this range of transformers are designed
to be fed from a nominal 50Hz supply voltage (+4% to -6%). Input and output cables are to be
routed through the gland plates provided with suitable conduit and glands, terminated above
the transformer Internally to the screw clamp terminals provided. Conduit should meet the
requirements of NR/L2/SIGELP/27410 Issue 2 & NR/L2/SIGELP/27421 & 27422.
●
On class I models an earth terminal is provided and shall always be connected to the
protective earth network.
●
Cable glands shall always be removed where hole profiles for conduit are being made. Never
drill holes on transformer panels in situ as swarf can enter the enclosure and short circuit the
magnetics when energized.
●
All cabling should meet the requirements of NR standards: NR/L2/SIGELP/27410 Issue 2 and
NR/L2/SIGELP/27421 & 27422
