Ask The Trades - External LED's. Which side of Transformer for PIR?

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Ask The Trades › DIY Forum › Electrical Questions › External LED's. Which side of Transformer for PIR?

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External LED's. Which side of Transformer for PIR? (Read 2310 times)

Mick01329

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External LED's. Which side of Transformer for PIR?
May 4^th, 2014, 12:52pm

Hi
Am looking to fit some external LED strips to a covered way, and control them via PIR, with 230v/12v transformer mounted internally.
Question is, should PIR be on primary or secondary of the transformer? I am only using 5mtr of strip, so looking at 100W max, which appears to be within the spec of many PIR's (using 100W inductive load rating). If I can, I'd prefer to switch primary side and not to have transformer operating unnecessarily.
Cheers

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8814 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: External LED's. Which side of Transformer for PIR? Reply #1 - May 4^th, 2014, 10:08pm You should always switch the primary.
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Mick01329 GDPR opt-out Total Thanks: 109 For This Post: 0	Re: External LED's. Which side of Transformer for PIR? Reply #2 - May 4^th, 2014, 10:13pm Lectrician Thanks for reply - certainly makes most sense.
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