engineering recuitment BSPHCL Technician (Electrician) 2024 Mock Test Estimation and Costing Estimation of Wiring

घर के वायरिंग में हरे रंग का तार क्या दर्शाता है?

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फेज
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उदासीन
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भूसम्पर्कन तार
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निष्क्रिय तार
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